61342591 has 4 divisors (see below), whose sum is σ = 61542712. Its totient is φ = 61142472.

The previous prime is 61342549. The next prime is 61342597. The reversal of 61342591 is 19524316.

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 61342591 - 2¹⁷ = 61211519 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 (61342597) 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, 99600 + ... + 100213.

It is an arithmetic number, because the mean of its divisors is an integer number (15385678).

Almost surely, 2^61342591 is an apocalyptic number.

61342591 is a deficient number, since it is larger than the sum of its proper divisors (200121).

61342591 is a wasteful number, since it uses less digits than its factorization.

61342591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200120.

The product of its digits is 6480, while the sum is 31.

The square root of 61342591 is about 7832.1511093696. The cubic root of 61342591 is about 394.3852875172.

The spelling of 61342591 in words is "sixty-one million, three hundred forty-two thousand, five hundred ninety-one".