1251533892 has 72 divisors (see below), whose sum is σ = 3410358336. Its totient is φ = 356177472.

The previous prime is 1251533887. The next prime is 1251533903. The reversal of 1251533892 is 2983351521.

It is a self number, because there is not a number n which added to its sum of digits gives 1251533892.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 150598 + ... + 158690.

It is an arithmetic number, because the mean of its divisors is an integer number (47366088).

Almost surely, 2^1251533892 is an apocalyptic number.

1251533892 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1251533892, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1705179168).

1251533892 is an abundant number, since it is smaller than the sum of its proper divisors (2158824444).

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

1251533892 is a wasteful number, since it uses less digits than its factorization.

1251533892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8377 (or 8368 counting only the distinct ones).

The product of its digits is 64800, while the sum is 39.

The square root of 1251533892 is about 35377.0249173104. The cubic root of 1251533892 is about 1077.6577875921.

The spelling of 1251533892 in words is "one billion, two hundred fifty-one million, five hundred thirty-three thousand, eight hundred ninety-two".