61799581 has 2 divisors, whose sum is σ = 61799582. Its totient is φ = 61799580.

The previous prime is 61799561. The next prime is 61799599. The reversal of 61799581 is 18599716.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39803481 + 21996100 = 6309^2 + 4690^2 .

It is a cyclic number.

It is not a de Polignac number, because 61799581 - 2⁹ = 61799069 is a prime.

It is a super-2 number, since 2×61799581² = 7638376423551122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61799561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30899790 + 30899791.

It is an arithmetic number, because the mean of its divisors is an integer number (30899791).

Almost surely, 2^61799581 is an apocalyptic number.

It is an amenable number.

61799581 is a deficient number, since it is larger than the sum of its proper divisors (1).

61799581 is an equidigital number, since it uses as much as digits as its factorization.

61799581 is an evil number, because the sum of its binary digits is even.

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

The square root of 61799581 is about 7861.2709532238. The cubic root of 61799581 is about 395.3622292764.

The spelling of 61799581 in words is "sixty-one million, seven hundred ninety-nine thousand, five hundred eighty-one".