61694891 has 4 divisors (see below), whose sum is σ = 61761672. Its totient is φ = 61628112.

The previous prime is 61694839. The next prime is 61694909. The reversal of 61694891 is 19849616.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61694891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61694821) 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, 31985 + ... + 33858.

It is an arithmetic number, because the mean of its divisors is an integer number (15440418).

Almost surely, 2^61694891 is an apocalyptic number.

61694891 is a deficient number, since it is larger than the sum of its proper divisors (66781).

61694891 is an equidigital number, since it uses as much as digits as its factorization.

61694891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66780.

The product of its digits is 93312, while the sum is 44.

The square root of 61694891 is about 7854.6095383539. The cubic root of 61694891 is about 395.1388520016.

The spelling of 61694891 in words is "sixty-one million, six hundred ninety-four thousand, eight hundred ninety-one".