51402657 has 16 divisors (see below), whose sum is σ = 74096960. Its totient is φ = 31586112.

The previous prime is 51402641. The next prime is 51402667. The reversal of 51402657 is 75620415.

It is not a de Polignac number, because 51402657 - 2⁴ = 51402641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51402607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10078 + ... + 14295.

It is an arithmetic number, because the mean of its divisors is an integer number (4631060).

Almost surely, 2^51402657 is an apocalyptic number.

51402657 is a gapful number since it is divisible by the number (57) formed by its first and last digit.

It is an amenable number.

51402657 is a deficient number, since it is larger than the sum of its proper divisors (22694303).

51402657 is a wasteful number, since it uses less digits than its factorization.

51402657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24432.

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 51402657 is about 7169.5646311335. The cubic root of 51402657 is about 371.8163838314.

The spelling of 51402657 in words is "fifty-one million, four hundred two thousand, six hundred fifty-seven".