61329557 has 12 divisors (see below), whose sum is σ = 65667300. Its totient is φ = 57263616.

The previous prime is 61329553. The next prime is 61329559. The reversal of 61329557 is 75592316.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 3964081 + 57365476 = 1991^2 + 7574^2 .

It is not a de Polignac number, because 61329557 - 2² = 61329553 is a prime.

It is a super-2 number, since 2×61329557² = 7522629123632498, which contains 22 as substring.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61329557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61329553) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38819 + ... + 40367.

It is an arithmetic number, because the mean of its divisors is an integer number (5472275).

Almost surely, 2^61329557 is an apocalyptic number.

It is an amenable number.

61329557 is a deficient number, since it is larger than the sum of its proper divisors (4337743).

61329557 is a wasteful number, since it uses less digits than its factorization.

61329557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1720 (or 1703 counting only the distinct ones).

The product of its digits is 56700, while the sum is 38.

The square root of 61329557 is about 7831.3189821383. The cubic root of 61329557 is about 394.3573527013.

The spelling of 61329557 in words is "sixty-one million, three hundred twenty-nine thousand, five hundred fifty-seven".