51100231 has 16 divisors (see below), whose sum is σ = 63112000. Its totient is φ = 40290048.

The previous prime is 51100229. The next prime is 51100237. The reversal of 51100231 is 13200115.

It is a cyclic number.

It is not a de Polignac number, because 51100231 - 2¹ = 51100229 is a prime.

It is a super-2 number, since 2×51100231² = 5222467216506722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51100237) 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, 30955 + ... + 32563.

It is an arithmetic number, because the mean of its divisors is an integer number (3944500).

Almost surely, 2^51100231 is an apocalyptic number.

51100231 is a deficient number, since it is larger than the sum of its proper divisors (12011769).

51100231 is a wasteful number, since it uses less digits than its factorization.

51100231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1978.

The product of its (nonzero) digits is 30, while the sum is 13.

The square root of 51100231 is about 7148.4425576485. The cubic root of 51100231 is about 371.0857588793.

Adding to 51100231 its reverse (13200115), we get a palindrome (64300346).

The spelling of 51100231 in words is "fifty-one million, one hundred thousand, two hundred thirty-one".