61320537 has 16 divisors (see below), whose sum is σ = 92959680. Its totient is φ = 39928896.

The previous prime is 61320517. The next prime is 61320541. The reversal of 61320537 is 73502316.

It is a happy number.

It is not a de Polignac number, because 61320537 - 2⁶ = 61320473 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 61320537.

It is not an unprimeable number, because it can be changed into a prime (61320517) 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, 25248 + ... + 27569.

It is an arithmetic number, because the mean of its divisors is an integer number (5809980).

Almost surely, 2^61320537 is an apocalyptic number.

It is an amenable number.

61320537 is a deficient number, since it is larger than the sum of its proper divisors (31639143).

61320537 is a wasteful number, since it uses less digits than its factorization.

61320537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52869 (or 52863 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 27.

The square root of 61320537 is about 7830.7430681896. The cubic root of 61320537 is about 394.3380184798.

The spelling of 61320537 in words is "sixty-one million, three hundred twenty thousand, five hundred thirty-seven".