51401817 has 16 divisors (see below), whose sum is σ = 77071680. Its totient is φ = 33853536.

The previous prime is 51401807. The next prime is 51401839. The reversal of 51401817 is 71810415.

It is not a de Polignac number, because 51401817 - 2¹⁵ = 51369049 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (51401807) 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, 9228 + ... + 13709.

It is an arithmetic number, because the mean of its divisors is an integer number (4816980).

Almost surely, 2^51401817 is an apocalyptic number.

It is an amenable number.

51401817 is a deficient number, since it is larger than the sum of its proper divisors (25669863).

51401817 is a wasteful number, since it uses less digits than its factorization.

51401817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23029 (or 23023 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 27.

The square root of 51401817 is about 7169.5060499312. The cubic root of 51401817 is about 371.8143584661.

The spelling of 51401817 in words is "fifty-one million, four hundred one thousand, eight hundred seventeen".