51615461 has 4 divisors (see below), whose sum is σ = 52195500. Its totient is φ = 51035424.

The previous prime is 51615439. The next prime is 51615469. The reversal of 51615461 is 16451615.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16451615 = 5 ⋅3290323.

It can be written as a sum of positive squares in 2 ways, for example, as 7392961 + 44222500 = 2719^2 + 6650^2 .

It is a cyclic number.

It is not a de Polignac number, because 51615461 - 2⁶ = 51615397 is a prime.

It is a Duffinian number.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 289886 + ... + 290063.

It is an arithmetic number, because the mean of its divisors is an integer number (13048875).

Almost surely, 2^51615461 is an apocalyptic number.

It is an amenable number.

51615461 is a deficient number, since it is larger than the sum of its proper divisors (580039).

51615461 is an equidigital number, since it uses as much as digits as its factorization.

51615461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580038.

The product of its digits is 3600, while the sum is 29.

The square root of 51615461 is about 7184.3900924156. The cubic root of 51615461 is about 372.3287767646.

The spelling of 51615461 in words is "fifty-one million, six hundred fifteen thousand, four hundred sixty-one".