1251771960 has 32 divisors (see below), whose sum is σ = 3755316240. Its totient is φ = 333805824.

The previous prime is 1251771923. The next prime is 1251771973. The reversal of 1251771960 is 691771521.

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 in 7 ways as a sum of consecutive naturals, for example, 5215597 + ... + 5215836.

Almost surely, 2^1251771960 is an apocalyptic number.

1251771960 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1251771960 is an abundant number, since it is smaller than the sum of its proper divisors (2503544280).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1251771960 is a wasteful number, since it uses less digits than its factorization.

1251771960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10431447 (or 10431443 counting only the distinct ones).

The product of its (nonzero) digits is 26460, while the sum is 39.

The square root of 1251771960 is about 35380.3894834412. The cubic root of 1251771960 is about 1077.7261142990.

The spelling of 1251771960 in words is "one billion, two hundred fifty-one million, seven hundred seventy-one thousand, nine hundred sixty".