51563739 has 8 divisors (see below), whose sum is σ = 72370240. Its totient is φ = 32566536.

The previous prime is 51563719. The next prime is 51563749. The reversal of 51563739 is 93736515.

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

It is not a de Polignac number, because 51563739 - 2²⁰ = 50515163 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51563697 and 51563706.

It is not an unprimeable number, because it can be changed into a prime (51563719) 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, 452257 + ... + 452370.

It is an arithmetic number, because the mean of its divisors is an integer number (9046280).

Almost surely, 2^51563739 is an apocalyptic number.

51563739 is a deficient number, since it is larger than the sum of its proper divisors (20806501).

51563739 is a wasteful number, since it uses less digits than its factorization.

51563739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 904649.

The product of its digits is 85050, while the sum is 39.

The square root of 51563739 is about 7180.7895805406. The cubic root of 51563739 is about 372.2043694349.

The spelling of 51563739 in words is "fifty-one million, five hundred sixty-three thousand, seven hundred thirty-nine".