51440613 has 32 divisors (see below), whose sum is σ = 80424960. Its totient is φ = 28641600.

The previous prime is 51440591. The next prime is 51440617. The reversal of 51440613 is 31604415.

It is not a de Polignac number, because 51440613 - 2¹⁰ = 51439589 is a prime.

It is a super-2 number, since 2×51440613² = 5292273331631538, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51440617) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 167406 + ... + 167712.

It is an arithmetic number, because the mean of its divisors is an integer number (2513280).

Almost surely, 2^51440613 is an apocalyptic number.

It is an amenable number.

51440613 is a deficient number, since it is larger than the sum of its proper divisors (28984347).

51440613 is a wasteful number, since it uses less digits than its factorization.

51440613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 51440613 is about 7172.2111653241. The cubic root of 51440613 is about 371.9078783915.

The spelling of 51440613 in words is "fifty-one million, four hundred forty thousand, six hundred thirteen".