1251601428 has 48 divisors (see below), whose sum is σ = 3641025024. Its totient is φ = 325091040.

The previous prime is 1251601427. The next prime is 1251601433. The reversal of 1251601428 is 8241061521.

It is a super-2 number, since 2×1251601428² = 3133012269143278368, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1251601395 and 1251601404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251601423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 676350 + ... + 678197.

It is an arithmetic number, because the mean of its divisors is an integer number (75854688).

Almost surely, 2^1251601428 is an apocalyptic number.

It is an amenable number.

1251601428 is an abundant number, since it is smaller than the sum of its proper divisors (2389423596).

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

1251601428 is a wasteful number, since it uses less digits than its factorization.

1251601428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1354572 (or 1354570 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 1251601428 is about 35377.9794222338. The cubic root of 1251601428 is about 1077.6771716423.

Adding to 1251601428 its reverse (8241061521), we get a palindrome (9492662949).

The spelling of 1251601428 in words is "one billion, two hundred fifty-one million, six hundred one thousand, four hundred twenty-eight".