51920001 has 16 divisors (see below), whose sum is σ = 87907200. Its totient is φ = 29668464.

The previous prime is 51919999. The next prime is 51920017. The reversal of 51920001 is 10002915.

It is not a de Polignac number, because 51920001 - 2¹ = 51919999 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51920021) 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, 137166 + ... + 137543.

It is an arithmetic number, because the mean of its divisors is an integer number (5494200).

Almost surely, 2^51920001 is an apocalyptic number.

It is an amenable number.

51920001 is a deficient number, since it is larger than the sum of its proper divisors (35987199).

51920001 is a wasteful number, since it uses less digits than its factorization.

51920001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274725 (or 274719 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 18.

The square root of 51920001 is about 7205.5534832517. The cubic root of 51920001 is about 373.0596090049.

Adding to 51920001 its reverse (10002915), we get a palindrome (61922916).

The spelling of 51920001 in words is "fifty-one million, nine hundred twenty thousand, one".