61461891 has 12 divisors (see below), whose sum is σ = 88908040. Its totient is φ = 40914720.

The previous prime is 61461859. The next prime is 61461901. The reversal of 61461891 is 19816416.

It is a happy number.

It is not a de Polignac number, because 61461891 - 2⁵ = 61461859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61461811) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2031 + ... + 11271.

Almost surely, 2^61461891 is an apocalyptic number.

61461891 is a deficient number, since it is larger than the sum of its proper divisors (27446149).

61461891 is a wasteful number, since it uses less digits than its factorization.

61461891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9986 (or 9983 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 61461891 is about 7839.7634530641. The cubic root of 61461891 is about 394.6407907799.

The spelling of 61461891 in words is "sixty-one million, four hundred sixty-one thousand, eight hundred ninety-one".