7861992133 has 4 divisors (see below), whose sum is σ = 8133095340. Its totient is φ = 7590888928.

The previous prime is 7861992067. The next prime is 7861992143. The reversal of 7861992133 is 3312991687.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3312991687 = 1031 ⋅3213377.

It can be written as a sum of positive squares in 2 ways, for example, as 1250188164 + 6611803969 = 35358^2 + 81313^2 .

It is a cyclic number.

It is not a de Polignac number, because 7861992133 - 2¹⁷ = 7861861061 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 (7861992143) 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, 135551560 + ... + 135551617.

It is an arithmetic number, because the mean of its divisors is an integer number (2033273835).

Almost surely, 2^7861992133 is an apocalyptic number.

It is an amenable number.

7861992133 is a deficient number, since it is larger than the sum of its proper divisors (271103207).

7861992133 is a wasteful number, since it uses less digits than its factorization.

7861992133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271103206.

The product of its digits is 489888, while the sum is 49.

The square root of 7861992133 is about 88667.8754284775. The cubic root of 7861992133 is about 1988.4325706883.

The spelling of 7861992133 in words is "seven billion, eight hundred sixty-one million, nine hundred ninety-two thousand, one hundred thirty-three".