8172120951 has 24 divisors (see below), whose sum is σ = 12582752000. Its totient is φ = 5095997712.

The previous prime is 8172120937. The next prime is 8172121003. The reversal of 8172120951 is 1590212718.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-8172120951 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 (8172120251) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 288961 + ... + 315978.

Almost surely, 2^8172120951 is an apocalyptic number.

8172120951 is a deficient number, since it is larger than the sum of its proper divisors (4410631049).

8172120951 is a wasteful number, since it uses less digits than its factorization.

8172120951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 605043 (or 605040 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 36.

The square root of 8172120951 is about 90399.7840207597. The cubic root of 8172120951 is about 2014.2417580289.

The spelling of 8172120951 in words is "eight billion, one hundred seventy-two million, one hundred twenty thousand, nine hundred fifty-one".