1021119949 has 2 divisors, whose sum is σ = 1021119950. Its totient is φ = 1021119948.

The previous prime is 1021119947. The next prime is 1021119971. The reversal of 1021119949 is 9499111201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 902702025 + 118417924 = 30045^2 + 10882^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021119949 - 2¹ = 1021119947 is a prime.

Together with 1021119947, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021119947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510559974 + 510559975.

It is an arithmetic number, because the mean of its divisors is an integer number (510559975).

Almost surely, 2^1021119949 is an apocalyptic number.

It is an amenable number.

1021119949 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021119949 is an equidigital number, since it uses as much as digits as its factorization.

1021119949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 37.

The square root of 1021119949 is about 31954.9675168040. The cubic root of 1021119949 is about 1006.9909950949.

The spelling of 1021119949 in words is "one billion, twenty-one million, one hundred nineteen thousand, nine hundred forty-nine".