61992791 has 16 divisors (see below), whose sum is σ = 72840000. Its totient is φ = 52736544.

The previous prime is 61992787. The next prime is 61992793. The reversal of 61992791 is 19729916.

It is not a de Polignac number, because 61992791 - 2² = 61992787 is a prime.

It is a super-2 number, since 2×61992791² = 7686212271939362, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61992793) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50501 + ... + 51713.

It is an arithmetic number, because the mean of its divisors is an integer number (4552500).

Almost surely, 2^61992791 is an apocalyptic number.

61992791 is a deficient number, since it is larger than the sum of its proper divisors (10847209).

61992791 is a wasteful number, since it uses less digits than its factorization.

61992791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1383 (or 1369 counting only the distinct ones).

The product of its digits is 61236, while the sum is 44.

The square root of 61992791 is about 7873.5500887465. The cubic root of 61992791 is about 395.7738203516.

The spelling of 61992791 in words is "sixty-one million, nine hundred ninety-two thousand, seven hundred ninety-one".