61557413 has 8 divisors (see below), whose sum is σ = 63974400. Its totient is φ = 59167440.

The previous prime is 61557403. The next prime is 61557427. The reversal of 61557413 is 31475516.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61557413 is a prime.

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 61557413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61557403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2045 + ... + 11282.

It is an arithmetic number, because the mean of its divisors is an integer number (7996800).

Almost surely, 2^61557413 is an apocalyptic number.

It is an amenable number.

61557413 is a deficient number, since it is larger than the sum of its proper divisors (2416987).

61557413 is a wasteful number, since it uses less digits than its factorization.

61557413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13507.

The product of its digits is 12600, while the sum is 32.

The square root of 61557413 is about 7845.8532359457. The cubic root of 61557413 is about 394.8451307635.

The spelling of 61557413 in words is "sixty-one million, five hundred fifty-seven thousand, four hundred thirteen".