51961563 has 24 divisors (see below), whose sum is σ = 76658400. Its totient is φ = 33909120.

The previous prime is 51961541. The next prime is 51961573. The reversal of 51961563 is 36516915.

51961563 is a `hidden beast` number, since 5 + 1 + 96 + 1 + 563 = 666.

It is not a de Polignac number, because 51961563 - 2⁹ = 51961051 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51961513) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 148713 + ... + 149061.

It is an arithmetic number, because the mean of its divisors is an integer number (3194100).

Almost surely, 2^51961563 is an apocalyptic number.

51961563 is a deficient number, since it is larger than the sum of its proper divisors (24696837).

51961563 is a wasteful number, since it uses less digits than its factorization.

51961563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 659 (or 656 counting only the distinct ones).

The product of its digits is 24300, while the sum is 36.

The square root of 51961563 is about 7208.4369318182. The cubic root of 51961563 is about 373.1591272877.

The spelling of 51961563 in words is "fifty-one million, nine hundred sixty-one thousand, five hundred sixty-three".