916636261 has 4 divisors (see below), whose sum is σ = 941410252. Its totient is φ = 891862272.

The previous prime is 916636223. The next prime is 916636271. The reversal of 916636261 is 162636619.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 723287236 + 193349025 = 26894^2 + 13905^2 .

It is a cyclic number.

It is not a de Polignac number, because 916636261 - 2¹⁷ = 916505189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (916636211) 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, 12386940 + ... + 12387013.

It is an arithmetic number, because the mean of its divisors is an integer number (235352563).

Almost surely, 2^916636261 is an apocalyptic number.

It is an amenable number.

916636261 is a deficient number, since it is larger than the sum of its proper divisors (24773991).

916636261 is a wasteful number, since it uses less digits than its factorization.

916636261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24773990.

The product of its digits is 69984, while the sum is 40.

The square root of 916636261 is about 30276.0014037521. The cubic root of 916636261 is about 971.4020398947.

The spelling of 916636261 in words is "nine hundred sixteen million, six hundred thirty-six thousand, two hundred sixty-one".