51618965 has 16 divisors (see below), whose sum is σ = 63168768. Its totient is φ = 40486656.

The previous prime is 51618949. The next prime is 51618967. The reversal of 51618965 is 56981615.

It is a cyclic number.

It is not a de Polignac number, because 51618965 - 2⁴ = 51618949 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 (51618967) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57752 + ... + 58638.

It is an arithmetic number, because the mean of its divisors is an integer number (3948048).

Almost surely, 2^51618965 is an apocalyptic number.

It is an amenable number.

51618965 is a deficient number, since it is larger than the sum of its proper divisors (11549803).

51618965 is a wasteful number, since it uses less digits than its factorization.

51618965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1108.

The product of its digits is 64800, while the sum is 41.

The square root of 51618965 is about 7184.6339503137. The cubic root of 51618965 is about 372.3372019566.

The spelling of 51618965 in words is "fifty-one million, six hundred eighteen thousand, nine hundred sixty-five".