51601040 has 20 divisors (see below), whose sum is σ = 119972604. Its totient is φ = 20640384.

The previous prime is 51601021. The next prime is 51601057. The reversal of 51601040 is 4010615.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 30514576 + 21086464 = 5524^2 + 4592^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 322427 + ... + 322586.

Almost surely, 2^51601040 is an apocalyptic number.

It is an amenable number.

51601040 is an abundant number, since it is smaller than the sum of its proper divisors (68371564).

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

51601040 is a wasteful number, since it uses less digits than its factorization.

51601040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645026 (or 645020 counting only the distinct ones).

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

The square root of 51601040 is about 7183.3863880485. The cubic root of 51601040 is about 372.2940981798.

Adding to 51601040 its reverse (4010615), we get a palindrome (55611655).

The spelling of 51601040 in words is "fifty-one million, six hundred one thousand, forty".