51613530 has 32 divisors (see below), whose sum is σ = 131160384. Its totient is φ = 12953856.

The previous prime is 51613511. The next prime is 51613537. The reversal of 51613530 is 3531615.

It is a self number, because there is not a number n which added to its sum of digits gives 51613530.

It is not an unprimeable number, because it can be changed into a prime (51613537) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50092 + ... + 51111.

It is an arithmetic number, because the mean of its divisors is an integer number (4098762).

Almost surely, 2^51613530 is an apocalyptic number.

51613530 is an abundant number, since it is smaller than the sum of its proper divisors (79546854).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51613530 is a wasteful number, since it uses less digits than its factorization.

51613530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101230.

The product of its (nonzero) digits is 1350, while the sum is 24.

The square root of 51613530 is about 7184.2557025763. The cubic root of 51613530 is about 372.3241336091.

The spelling of 51613530 in words is "fifty-one million, six hundred thirteen thousand, five hundred thirty".