61602581 has 2 divisors, whose sum is σ = 61602582. Its totient is φ = 61602580.

The previous prime is 61602559. The next prime is 61602587. The reversal of 61602581 is 18520616.

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., 60062500 + 1540081 = 7750^2 + 1241^2 .

It is a cyclic number.

It is not a de Polignac number, because 61602581 - 2²² = 57408277 is a prime.

It is a super-2 number, since 2×61602581² = 7589755971723122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61602587) 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 as a sum of consecutive naturals, namely, 30801290 + 30801291.

It is an arithmetic number, because the mean of its divisors is an integer number (30801291).

Almost surely, 2^61602581 is an apocalyptic number.

It is an amenable number.

61602581 is a deficient number, since it is larger than the sum of its proper divisors (1).

61602581 is an equidigital number, since it uses as much as digits as its factorization.

61602581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 61602581 is about 7848.7311713423. The cubic root of 61602581 is about 394.9416802217.

The spelling of 61602581 in words is "sixty-one million, six hundred two thousand, five hundred eighty-one".