9156402221 has 4 divisors (see below), whose sum is σ = 9183572892. Its totient is φ = 9129231552.

The previous prime is 9156402209. The next prime is 9156402239. The reversal of 9156402221 is 1222046519.

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 728244196 + 8428158025 = 26986^2 + 91805^2 .

It is a cyclic number.

It is not a de Polignac number, because 9156402221 - 2²² = 9152207917 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 (9156402251) 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, 13584830 + ... + 13585503.

It is an arithmetic number, because the mean of its divisors is an integer number (2295893223).

Almost surely, 2^9156402221 is an apocalyptic number.

It is an amenable number.

9156402221 is a deficient number, since it is larger than the sum of its proper divisors (27170671).

9156402221 is a wasteful number, since it uses less digits than its factorization.

9156402221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27170670.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 9156402221 is about 95689.0914420238. The cubic root of 9156402221 is about 2092.0639410675.

The spelling of 9156402221 in words is "nine billion, one hundred fifty-six million, four hundred two thousand, two hundred twenty-one".