916870621 has 4 divisors (see below), whose sum is σ = 920523744. Its totient is φ = 913217500.

The previous prime is 916870589. The next prime is 916870637. The reversal of 916870621 is 126078619.

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 916870621 - 2⁵ = 916870589 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (916870651) 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, 1826185 + ... + 1826686.

It is an arithmetic number, because the mean of its divisors is an integer number (230130936).

Almost surely, 2^916870621 is an apocalyptic number.

It is an amenable number.

916870621 is a deficient number, since it is larger than the sum of its proper divisors (3653123).

916870621 is a wasteful number, since it uses less digits than its factorization.

916870621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3653122.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 916870621 is about 30279.8715486047. The cubic root of 916870621 is about 971.4848202343.

The spelling of 916870621 in words is "nine hundred sixteen million, eight hundred seventy thousand, six hundred twenty-one".