51439263 has 8 divisors (see below), whose sum is σ = 72620208. Its totient is φ = 32275584.

The previous prime is 51439259. The next prime is 51439277. The reversal of 51439263 is 36293415.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51439263 - 2² = 51439259 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51439363) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 504256 + ... + 504357.

It is an arithmetic number, because the mean of its divisors is an integer number (9077526).

Almost surely, 2^51439263 is an apocalyptic number.

51439263 is a deficient number, since it is larger than the sum of its proper divisors (21180945).

51439263 is a wasteful number, since it uses less digits than its factorization.

51439263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1008633.

The product of its digits is 19440, while the sum is 33.

The square root of 51439263 is about 7172.1170514709. The cubic root of 51439263 is about 371.9046249308.

The spelling of 51439263 in words is "fifty-one million, four hundred thirty-nine thousand, two hundred sixty-three".