61993291 has 4 divisors (see below), whose sum is σ = 62918632. Its totient is φ = 61067952.

The previous prime is 61993259. The next prime is 61993297. The reversal of 61993291 is 19239916.

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 61993291 - 2⁵ = 61993259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61993297) 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, 462570 + ... + 462703.

It is an arithmetic number, because the mean of its divisors is an integer number (15729658).

Almost surely, 2^61993291 is an apocalyptic number.

61993291 is a deficient number, since it is larger than the sum of its proper divisors (925341).

61993291 is an equidigital number, since it uses as much as digits as its factorization.

61993291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 925340.

The product of its digits is 26244, while the sum is 40.

The square root of 61993291 is about 7873.5818405602. The cubic root of 61993291 is about 395.7748843806.

The spelling of 61993291 in words is "sixty-one million, nine hundred ninety-three thousand, two hundred ninety-one".