61565389 has 4 divisors (see below), whose sum is σ = 61637920. Its totient is φ = 61492860.

The previous prime is 61565363. The next prime is 61565393. The reversal of 61565389 is 98356516.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61565389 - 2²¹ = 59468237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61566389) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34977 + ... + 36694.

It is an arithmetic number, because the mean of its divisors is an integer number (15409480).

Almost surely, 2^61565389 is an apocalyptic number.

It is an amenable number.

61565389 is a deficient number, since it is larger than the sum of its proper divisors (72531).

61565389 is an equidigital number, since it uses as much as digits as its factorization.

61565389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72530.

The product of its digits is 194400, while the sum is 43.

The square root of 61565389 is about 7846.3615134660. The cubic root of 61565389 is about 394.8621834010.

The spelling of 61565389 in words is "sixty-one million, five hundred sixty-five thousand, three hundred eighty-nine".