51615465 has 32 divisors (see below), whose sum is σ = 93007872. Its totient is φ = 24216000.

The previous prime is 51615439. The next prime is 51615469. The reversal of 51615465 is 56451615.

It is not a de Polignac number, because 51615465 - 2⁶ = 51615401 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (51615469) 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, 70 + ... + 10160.

It is an arithmetic number, because the mean of its divisors is an integer number (2906496).

Almost surely, 2^51615465 is an apocalyptic number.

51615465 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51615465 is a deficient number, since it is larger than the sum of its proper divisors (41392407).

51615465 is a wasteful number, since it uses less digits than its factorization.

51615465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10141.

The product of its digits is 18000, while the sum is 33.

The square root of 51615465 is about 7184.3903707970. The cubic root of 51615465 is about 372.3287863826.

It can be divided in two parts, 51 and 615465, that added together give a palindrome (615516).

The spelling of 51615465 in words is "fifty-one million, six hundred fifteen thousand, four hundred sixty-five".