51431005 has 16 divisors (see below), whose sum is σ = 65229120. Its totient is φ = 38821248.

The previous prime is 51430963. The next prime is 51431011. The reversal of 51431005 is 50013415.

It is a cyclic number.

It is not a de Polignac number, because 51431005 - 2⁷ = 51430877 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25929 + ... + 27841.

It is an arithmetic number, because the mean of its divisors is an integer number (4076820).

Almost surely, 2^51431005 is an apocalyptic number.

It is an amenable number.

51431005 is a deficient number, since it is larger than the sum of its proper divisors (13798115).

51431005 is a wasteful number, since it uses less digits than its factorization.

51431005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2220.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 51431005 is about 7171.5413266605. The cubic root of 51431005 is about 371.8847221524.

It can be divided in two parts, 51 and 431005, that added together give a triangular number (431056 = T₉₂₈).

The spelling of 51431005 in words is "fifty-one million, four hundred thirty-one thousand, five".