61117657 has 4 divisors (see below), whose sum is σ = 61584336. Its totient is φ = 60650980.

The previous prime is 61117649. The next prime is 61117681. The reversal of 61117657 is 75671116.

61117657 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61117657 - 2³ = 61117649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61117697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 233143 + ... + 233404.

It is an arithmetic number, because the mean of its divisors is an integer number (15396084).

Almost surely, 2^61117657 is an apocalyptic number.

It is an amenable number.

61117657 is a deficient number, since it is larger than the sum of its proper divisors (466679).

61117657 is a wasteful number, since it uses less digits than its factorization.

61117657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466678.

The product of its digits is 8820, while the sum is 34.

The square root of 61117657 is about 7817.7782649548. The cubic root of 61117657 is about 393.9026467192.

The spelling of 61117657 in words is "sixty-one million, one hundred seventeen thousand, six hundred fifty-seven".