51429915 has 24 divisors (see below), whose sum is σ = 90406368. Its totient is φ = 27041280.

The previous prime is 51429901. The next prime is 51429919. The reversal of 51429915 is 51992415.

It is not a de Polignac number, because 51429915 - 2¹¹ = 51427867 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51429915.

It is not an unprimeable number, because it can be changed into a prime (51429919) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4854 + ... + 11243.

It is an arithmetic number, because the mean of its divisors is an integer number (3766932).

Almost surely, 2^51429915 is an apocalyptic number.

51429915 is a deficient number, since it is larger than the sum of its proper divisors (38976453).

51429915 is a wasteful number, since it uses less digits than its factorization.

51429915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16179 (or 16176 counting only the distinct ones).

The product of its digits is 16200, while the sum is 36.

The square root of 51429915 is about 7171.4653314368. The cubic root of 51429915 is about 371.8820949615.

Subtracting 51429915 from its reverse (51992415), we obtain a square (562500 = 750²).

The spelling of 51429915 in words is "fifty-one million, four hundred twenty-nine thousand, nine hundred fifteen".