61359581 has 16 divisors (see below), whose sum is σ = 64990464. Its totient is φ = 57867264.

The previous prime is 61359577. The next prime is 61359583. The reversal of 61359581 is 18595316.

It is a cyclic number.

It is not a de Polignac number, because 61359581 - 2² = 61359577 is a prime.

It is a super-2 number, since 2×61359581² = 7529996360991122, 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 (61359583) 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, 195881 + ... + 196193.

It is an arithmetic number, because the mean of its divisors is an integer number (4061904).

Almost surely, 2^61359581 is an apocalyptic number.

It is an amenable number.

61359581 is a deficient number, since it is larger than the sum of its proper divisors (3630883).

61359581 is a wasteful number, since it uses less digits than its factorization.

61359581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500.

The product of its digits is 32400, while the sum is 38.

The square root of 61359581 is about 7833.2356660578. The cubic root of 61359581 is about 394.4216949975.

The spelling of 61359581 in words is "sixty-one million, three hundred fifty-nine thousand, five hundred eighty-one".