1248771949 has 4 divisors (see below), whose sum is σ = 1248843580. Its totient is φ = 1248700320.

The previous prime is 1248771919. The next prime is 1248771971. The reversal of 1248771949 is 9491778421.

It is a happy 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.

It can be written as a sum of positive squares in 2 ways, for example, as 1191285225 + 57486724 = 34515^2 + 7582^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1248771949 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1248771896 and 1248771905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1248771919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9169 + ... + 50809.

It is an arithmetic number, because the mean of its divisors is an integer number (312210895).

Almost surely, 2^1248771949 is an apocalyptic number.

It is an amenable number.

1248771949 is a deficient number, since it is larger than the sum of its proper divisors (71631).

1248771949 is an equidigital number, since it uses as much as digits as its factorization.

1248771949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71630.

The product of its digits is 1016064, while the sum is 52.

The square root of 1248771949 is about 35337.9675278588. The cubic root of 1248771949 is about 1076.8644620051.

The spelling of 1248771949 in words is "one billion, two hundred forty-eight million, seven hundred seventy-one thousand, nine hundred forty-nine".