51438651 has 16 divisors (see below), whose sum is σ = 79221888. Its totient is φ = 29340800.

The previous prime is 51438613. The next prime is 51438661. The reversal of 51438651 is 15683415.

It is a cyclic number.

It is not a de Polignac number, because 51438651 - 2⁶ = 51438587 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 (51438601) 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, 45285 + ... + 46406.

It is an arithmetic number, because the mean of its divisors is an integer number (4951368).

Almost surely, 2^51438651 is an apocalyptic number.

51438651 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

51438651 is a deficient number, since it is larger than the sum of its proper divisors (27783237).

51438651 is a wasteful number, since it uses less digits than its factorization.

51438651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91722.

The product of its digits is 14400, while the sum is 33.

The square root of 51438651 is about 7172.0743861173. The cubic root of 51438651 is about 371.9031500099.

The spelling of 51438651 in words is "fifty-one million, four hundred thirty-eight thousand, six hundred fifty-one".