61920691 has 4 divisors (see below), whose sum is σ = 70766512. Its totient is φ = 53074872.

The previous prime is 61920689. The next prime is 61920697. The reversal of 61920691 is 19602916.

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 61920691 - 2¹ = 61920689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61920697) 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, 4422900 + ... + 4422913.

It is an arithmetic number, because the mean of its divisors is an integer number (17691628).

Almost surely, 2^61920691 is an apocalyptic number.

61920691 is a deficient number, since it is larger than the sum of its proper divisors (8845821).

61920691 is an equidigital number, since it uses as much as digits as its factorization.

61920691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8845820.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 61920691 is about 7868.9701359199. The cubic root of 61920691 is about 395.6203274390.

The spelling of 61920691 in words is "sixty-one million, nine hundred twenty thousand, six hundred ninety-one".