51899247 has 12 divisors (see below), whose sum is σ = 78225264. Its totient is φ = 33095040.

The previous prime is 51899219. The next prime is 51899251. The reversal of 51899247 is 74299815.

51899247 is a `hidden beast` number, since 518 + 9 + 92 + 47 = 666.

It is not a de Polignac number, because 51899247 - 2¹⁶ = 51833711 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51899297) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 125154 + ... + 125567.

It is an arithmetic number, because the mean of its divisors is an integer number (6518772).

Almost surely, 2^51899247 is an apocalyptic number.

51899247 is a deficient number, since it is larger than the sum of its proper divisors (26326017).

51899247 is a wasteful number, since it uses less digits than its factorization.

51899247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250750 (or 250747 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 51899247 is about 7204.1132001101. The cubic root of 51899247 is about 373.0098946312.

The spelling of 51899247 in words is "fifty-one million, eight hundred ninety-nine thousand, two hundred forty-seven".