116561001 has 4 divisors (see below), whose sum is σ = 155414672. Its totient is φ = 77707332.

The previous prime is 116560979. The next prime is 116561009. The reversal of 116561001 is 100165611.

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 not a de Polignac number, because 116561001 - 2⁶ = 116560937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (116561009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19426831 + ... + 19426836.

It is an arithmetic number, because the mean of its divisors is an integer number (38853668).

Almost surely, 2^116561001 is an apocalyptic number.

It is an amenable number.

116561001 is a deficient number, since it is larger than the sum of its proper divisors (38853671).

116561001 is an equidigital number, since it uses as much as digits as its factorization.

116561001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38853670.

The product of its (nonzero) digits is 180, while the sum is 21.

The square root of 116561001 is about 10796.3420194064. The cubic root of 116561001 is about 488.4848393475.

The spelling of 116561001 in words is "one hundred sixteen million, five hundred sixty-one thousand, one".