1261498904 has 8 divisors (see below), whose sum is σ = 2365310460. Its totient is φ = 630749448.

The previous prime is 1261498859. The next prime is 1261498913. The reversal of 1261498904 is 4098941621.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78843674 + ... + 78843689.

Almost surely, 2^1261498904 is an apocalyptic number.

It is an amenable number.

1261498904 is a deficient number, since it is larger than the sum of its proper divisors (1103811556).

1261498904 is a wasteful number, since it uses less digits than its factorization.

1261498904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157687369 (or 157687365 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 44.

The square root of 1261498904 is about 35517.5858413829. The cubic root of 1261498904 is about 1080.5104194548.

The spelling of 1261498904 in words is "one billion, two hundred sixty-one million, four hundred ninety-eight thousand, nine hundred four".