1251601530 has 16 divisors (see below), whose sum is σ = 3003843744. Its totient is φ = 333760400.

The previous prime is 1251601499. The next prime is 1251601537. The reversal of 1251601530 is 351061521.

It is a self number, because there is not a number n which added to its sum of digits gives 1251601530.

It is not an unprimeable number, because it can be changed into a prime (1251601537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20859996 + ... + 20860055.

It is an arithmetic number, because the mean of its divisors is an integer number (187740234).

Almost surely, 2^1251601530 is an apocalyptic number.

1251601530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1251601530 is an abundant number, since it is smaller than the sum of its proper divisors (1752242214).

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

1251601530 is a wasteful number, since it uses less digits than its factorization.

1251601530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41720061.

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 1251601530 is about 35377.9808638085. The cubic root of 1251601530 is about 1077.6772009176.

The spelling of 1251601530 in words is "one billion, two hundred fifty-one million, six hundred one thousand, five hundred thirty".