61795981 has 4 divisors (see below), whose sum is σ = 66549532. Its totient is φ = 57042432.

The previous prime is 61795967. The next prime is 61796017. The reversal of 61795981 is 18959716.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 32959081 + 28836900 = 5741^2 + 5370^2 .

It is a cyclic number.

It is not a de Polignac number, because 61795981 - 2⁹ = 61795469 is a prime.

It is a super-2 number, since 2×61795981² = 7637486535504722, 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 (61795931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2376756 + ... + 2376781.

It is an arithmetic number, because the mean of its divisors is an integer number (16637383).

Almost surely, 2^61795981 is an apocalyptic number.

It is an amenable number.

61795981 is a deficient number, since it is larger than the sum of its proper divisors (4753551).

61795981 is a wasteful number, since it uses less digits than its factorization.

61795981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4753550.

The product of its digits is 136080, while the sum is 46.

The square root of 61795981 is about 7861.0419792798. The cubic root of 61795981 is about 395.3545521388.

The spelling of 61795981 in words is "sixty-one million, seven hundred ninety-five thousand, nine hundred eighty-one".