100561657 has 4 divisors (see below), whose sum is σ = 114927616. Its totient is φ = 86195700.

The previous prime is 100561639. The next prime is 100561667. The reversal of 100561657 is 756165001.

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, and also an emirpimes, since its reverse is a distinct semiprime: 756165001 = 1223 ⋅618287.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100561657 is a prime.

It is a super-2 number, since 2×100561657² = 20225293717171298, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100561607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7182969 + ... + 7182982.

It is an arithmetic number, because the mean of its divisors is an integer number (28731904).

Almost surely, 2^100561657 is an apocalyptic number.

It is an amenable number.

100561657 is a deficient number, since it is larger than the sum of its proper divisors (14365959).

100561657 is an equidigital number, since it uses as much as digits as its factorization.

100561657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14365958.

The product of its (nonzero) digits is 6300, while the sum is 31.

The square root of 100561657 is about 10028.0435280268. The cubic root of 100561657 is about 465.0262551175.

The spelling of 100561657 in words is "one hundred million, five hundred sixty-one thousand, six hundred fifty-seven".