61913563 has 4 divisors (see below), whose sum is σ = 62761768. Its totient is φ = 61065360.

The previous prime is 61913557. The next prime is 61913639. The reversal of 61913563 is 36531916.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61913563 - 2⁵ = 61913531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61913503) 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, 423993 + ... + 424138.

It is an arithmetic number, because the mean of its divisors is an integer number (15690442).

Almost surely, 2^61913563 is an apocalyptic number.

61913563 is a deficient number, since it is larger than the sum of its proper divisors (848205).

61913563 is an equidigital number, since it uses as much as digits as its factorization.

61913563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 848204.

The product of its digits is 14580, while the sum is 34.

The square root of 61913563 is about 7868.5172046581. The cubic root of 61913563 is about 395.6051462459.

The spelling of 61913563 in words is "sixty-one million, nine hundred thirteen thousand, five hundred sixty-three".