1251253560 has 64 divisors (see below), whose sum is σ = 3841073280. Its totient is φ = 325906560.

The previous prime is 1251253559. The next prime is 1251253583. The reversal of 1251253560 is 653521521.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 116086 + ... + 126405.

It is an arithmetic number, because the mean of its divisors is an integer number (60016770).

Almost surely, 2^1251253560 is an apocalyptic number.

1251253560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1251253560 is an abundant number, since it is smaller than the sum of its proper divisors (2589819720).

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

1251253560 is a wasteful number, since it uses less digits than its factorization.

1251253560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242548 (or 242544 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 30.

The square root of 1251253560 is about 35373.0626324609. The cubic root of 1251253560 is about 1077.5773197961.

The spelling of 1251253560 in words is "one billion, two hundred fifty-one million, two hundred fifty-three thousand, five hundred sixty".