51531113 has 2 divisors, whose sum is σ = 51531114. Its totient is φ = 51531112.

The previous prime is 51531079. The next prime is 51531119. The reversal of 51531113 is 31113515.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27008809 + 24522304 = 5197^2 + 4952^2 .

It is a cyclic number.

It is not a de Polignac number, because 51531113 - 2⁶ = 51531049 is a prime.

It is a super-3 number, since 3×51531113³ (a number of 24 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (51531119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25765556 + 25765557.

It is an arithmetic number, because the mean of its divisors is an integer number (25765557).

Almost surely, 2^51531113 is an apocalyptic number.

It is an amenable number.

51531113 is a deficient number, since it is larger than the sum of its proper divisors (1).

51531113 is an equidigital number, since it uses as much as digits as its factorization.

51531113 is an evil number, because the sum of its binary digits is even.

The product of its digits is 225, while the sum is 20.

The square root of 51531113 is about 7178.5174653267. The cubic root of 51531113 is about 372.1258510672.

Adding to 51531113 its reverse (31113515), we get a palindrome (82644628).

The spelling of 51531113 in words is "fifty-one million, five hundred thirty-one thousand, one hundred thirteen".