1021249849 has 3 divisors (see below), whose sum is σ = 1021281807. Its totient is φ = 1021217892.

The previous prime is 1021249847. The next prime is 1021249883. The reversal of 1021249849 is 9489421201.

The square root of 1021249849 is 31957.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9489421201 = 13 ⋅729955477.

It can be written as a sum of positive squares in only one way, i.e., 817674025 + 203575824 = 28595^2 + 14268^2 .

It is not a de Polignac number, because 1021249849 - 2¹ = 1021249847 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021249843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 15979 + ... + 47935.

It is an arithmetic number, because the mean of its divisors is an integer number (340427269).

Almost surely, 2^1021249849 is an apocalyptic number.

1021249849 is the 31957-th square number.

1021249849 is the 15979-th centered octagonal number.

It is an amenable number.

1021249849 is a deficient number, since it is larger than the sum of its proper divisors (31958).

1021249849 is an frugal number, since it uses more digits than its factorization.

1021249849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63914 (or 31957 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 40.

The cubic root of 1021249849 is about 1007.0336941542.

The spelling of 1021249849 in words is "one billion, twenty-one million, two hundred forty-nine thousand, eight hundred forty-nine".