61399791 has 6 divisors (see below), whose sum is σ = 88688600. Its totient is φ = 40933188.

The previous prime is 61399727. The next prime is 61399799. The reversal of 61399791 is 19799316.

It is not a de Polignac number, because 61399791 - 2⁶ = 61399727 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61399799) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3411091 + ... + 3411108.

Almost surely, 2^61399791 is an apocalyptic number.

61399791 is a deficient number, since it is larger than the sum of its proper divisors (27288809).

61399791 is a wasteful number, since it uses less digits than its factorization.

61399791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6822205 (or 6822202 counting only the distinct ones).

The product of its digits is 91854, while the sum is 45.

The square root of 61399791 is about 7835.8018734524. The cubic root of 61399791 is about 394.5078333151.

The spelling of 61399791 in words is "sixty-one million, three hundred ninety-nine thousand, seven hundred ninety-one".