51601004 has 24 divisors (see below), whose sum is σ = 111141408. Its totient is φ = 20413440.

The previous prime is 51601003. The next prime is 51601007. The reversal of 51601004 is 40010615.

It is a happy number.

It is a super-2 number, since 2×51601004² = 5325327227616032, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51601003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70517 + ... + 71244.

It is an arithmetic number, because the mean of its divisors is an integer number (4630892).

Almost surely, 2^51601004 is an apocalyptic number.

It is an amenable number.

51601004 is an abundant number, since it is smaller than the sum of its proper divisors (59540404).

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

51601004 is a wasteful number, since it uses less digits than its factorization.

51601004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141785 (or 141783 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 51601004 is about 7183.3838822661. The cubic root of 51601004 is about 372.2940116015.

Adding to 51601004 its reverse (40010615), we get a palindrome (91611619).

The spelling of 51601004 in words is "fifty-one million, six hundred one thousand, four".