7812999971 has 6 divisors (see below), whose sum is σ = 9088591860. Its totient is φ = 6696857076.

The previous prime is 7812999959. The next prime is 7812999983. The reversal of 7812999971 is 1799992187.

It is an interprime number because it is at equal distance from previous prime (7812999959) and next prime (7812999983).

It is not a de Polignac number, because 7812999971 - 2¹⁸ = 7812737827 is a prime.

It is a super-2 number, since 2×7812999971² (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 (7812999941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 79724441 + ... + 79724538.

It is an arithmetic number, because the mean of its divisors is an integer number (1514765310).

Almost surely, 2^7812999971 is an apocalyptic number.

7812999971 is a deficient number, since it is larger than the sum of its proper divisors (1275591889).

7812999971 is a wasteful number, since it uses less digits than its factorization.

7812999971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159448993 (or 159448986 counting only the distinct ones).

The product of its digits is 5143824, while the sum is 62.

The square root of 7812999971 is about 88391.1758661463. The cubic root of 7812999971 is about 1984.2936422969.

The spelling of 7812999971 in words is "seven billion, eight hundred twelve million, nine hundred ninety-nine thousand, nine hundred seventy-one".