8151971123 has 4 divisors (see below), whose sum is σ = 8216160000. Its totient is φ = 8087782248.

The previous prime is 8151971117. The next prime is 8151971129. The reversal of 8151971123 is 3211791518.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (8151971117) and next prime (8151971129).

It is a cyclic number.

It is not a de Polignac number, because 8151971123 - 2¹⁸ = 8151708979 is a prime.

It is a super-2 number, since 2×8151971123² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8151971129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32094248 + ... + 32094501.

It is an arithmetic number, because the mean of its divisors is an integer number (2054040000).

Almost surely, 2^8151971123 is an apocalyptic number.

8151971123 is a deficient number, since it is larger than the sum of its proper divisors (64188877).

8151971123 is a wasteful number, since it uses less digits than its factorization.

8151971123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64188876.

The product of its digits is 15120, while the sum is 38.

The square root of 8151971123 is about 90288.2668069334. The cubic root of 8151971123 is about 2012.5849042430.

The spelling of 8151971123 in words is "eight billion, one hundred fifty-one million, nine hundred seventy-one thousand, one hundred twenty-three".