61368591 has 4 divisors (see below), whose sum is σ = 81824792. Its totient is φ = 40912392.

The previous prime is 61368569. The next prime is 61368661. The reversal of 61368591 is 19586316.

61368591 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 61368591 - 2¹⁸ = 61106447 is a prime.

It is a super-2 number, since 2×61368591² = 7532207922650562, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61364591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10228096 + ... + 10228101.

It is an arithmetic number, because the mean of its divisors is an integer number (20456198).

Almost surely, 2^61368591 is an apocalyptic number.

61368591 is a deficient number, since it is larger than the sum of its proper divisors (20456201).

61368591 is a wasteful number, since it uses less digits than its factorization.

61368591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20456200.

The product of its digits is 38880, while the sum is 39.

The square root of 61368591 is about 7833.8107585006. The cubic root of 61368591 is about 394.4409995923.

The spelling of 61368591 in words is "sixty-one million, three hundred sixty-eight thousand, five hundred ninety-one".