51423895 has 32 divisors (see below), whose sum is σ = 68257728. Its totient is φ = 37029888.

The previous prime is 51423893. The next prime is 51423913. The reversal of 51423895 is 59832415.

51423895 = 124² + 125² + ... + 538².

It is a cyclic number.

It is not a de Polignac number, because 51423895 - 2¹ = 51423893 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51423893) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 260937 + ... + 261133.

It is an arithmetic number, because the mean of its divisors is an integer number (2133054).

Almost surely, 2^51423895 is an apocalyptic number.

51423895 is a deficient number, since it is larger than the sum of its proper divisors (16833833).

51423895 is a wasteful number, since it uses less digits than its factorization.

51423895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339.

The product of its digits is 43200, while the sum is 37.

The square root of 51423895 is about 7171.0456001897. The cubic root of 51423895 is about 371.8675844860.

The spelling of 51423895 in words is "fifty-one million, four hundred twenty-three thousand, eight hundred ninety-five".