1261905952 has 24 divisors (see below), whose sum is σ = 2485176876. Its totient is φ = 630749952.

The previous prime is 1261905949. The next prime is 1261905977. The reversal of 1261905952 is 2595091621.

It can be written as a sum of positive squares in 2 ways, for example, as 1233133456 + 28772496 = 35116^2 + 5364^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 170358 + ... + 177610.

Almost surely, 2^1261905952 is an apocalyptic number.

It is an amenable number.

1261905952 is a deficient number, since it is larger than the sum of its proper divisors (1223270924).

1261905952 is an equidigital number, since it uses as much as digits as its factorization.

1261905952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12700 (or 12692 counting only the distinct ones).

The product of its (nonzero) digits is 48600, while the sum is 40.

The square root of 1261905952 is about 35523.3156110181. The cubic root of 1261905952 is about 1080.6266230987.

The spelling of 1261905952 in words is "one billion, two hundred sixty-one million, nine hundred five thousand, nine hundred fifty-two".