61398591 has 8 divisors (see below), whose sum is σ = 83606784. Its totient is φ = 40061400.

The previous prime is 61398583. The next prime is 61398613. The reversal of 61398591 is 19589316.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61398591 - 2³ = 61398583 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61398551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 217585 + ... + 217866.

It is an arithmetic number, because the mean of its divisors is an integer number (10450848).

Almost surely, 2^61398591 is an apocalyptic number.

61398591 is a deficient number, since it is larger than the sum of its proper divisors (22208193).

61398591 is a wasteful number, since it uses less digits than its factorization.

61398591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435501.

The product of its digits is 58320, while the sum is 42.

The square root of 61398591 is about 7835.7253014638. The cubic root of 61398591 is about 394.5052632060.

The spelling of 61398591 in words is "sixty-one million, three hundred ninety-eight thousand, five hundred ninety-one".