51501405 has 16 divisors (see below), whose sum is σ = 82669824. Its totient is φ = 27378240.

The previous prime is 51501397. The next prime is 51501409. The reversal of 51501405 is 50410515.

It is not a de Polignac number, because 51501405 - 2³ = 51501397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51501409) 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, 661 + ... + 10170.

It is an arithmetic number, because the mean of its divisors is an integer number (5166864).

Almost surely, 2^51501405 is an apocalyptic number.

It is an amenable number.

51501405 is a deficient number, since it is larger than the sum of its proper divisors (31168419).

51501405 is a wasteful number, since it uses less digits than its factorization.

51501405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11156.

The product of its (nonzero) digits is 500, while the sum is 21.

The square root of 51501405 is about 7176.4479375245. The cubic root of 51501405 is about 372.0543263820.

It can be divided in two parts, 5150 and 1405, that added together give a triangular number (6555 = T₁₁₄).

The spelling of 51501405 in words is "fifty-one million, five hundred one thousand, four hundred five".