1251535432 has 64 divisors (see below), whose sum is σ = 2805580800. Its totient is φ = 511748160.

The previous prime is 1251535423. The next prime is 1251535463. The reversal of 1251535432 is 2345351521.

It is a junction number, because it is equal to n+sod(n) for n = 1251535394 and 1251535403.

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 15 ways as a sum of consecutive naturals, for example, 631419 + ... + 633397.

It is an arithmetic number, because the mean of its divisors is an integer number (43837200).

Almost surely, 2^1251535432 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1251535432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1402790400).

1251535432 is an abundant number, since it is smaller than the sum of its proper divisors (1554045368).

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

1251535432 is a wasteful number, since it uses less digits than its factorization.

1251535432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2506 (or 2502 counting only the distinct ones).

The product of its digits is 18000, while the sum is 31.

The square root of 1251535432 is about 35377.0466828423. The cubic root of 1251535432 is about 1077.6582296076.

Adding to 1251535432 its reverse (2345351521), we get a palindrome (3596886953).

The spelling of 1251535432 in words is "one billion, two hundred fifty-one million, five hundred thirty-five thousand, four hundred thirty-two".