51531611 has 4 divisors (see below), whose sum is σ = 51550800. Its totient is φ = 51512424.

The previous prime is 51531593. The next prime is 51531617. The reversal of 51531611 is 11613515.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51531611 - 2¹⁴ = 51515227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51531617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4751 + ... + 11208.

It is an arithmetic number, because the mean of its divisors is an integer number (12887700).

Almost surely, 2^51531611 is an apocalyptic number.

51531611 is a deficient number, since it is larger than the sum of its proper divisors (19189).

51531611 is a wasteful number, since it uses less digits than its factorization.

51531611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19188.

The product of its digits is 450, while the sum is 23.

The square root of 51531611 is about 7178.5521520708. The cubic root of 51531611 is about 372.1270498127.

The spelling of 51531611 in words is "fifty-one million, five hundred thirty-one thousand, six hundred eleven".