8132920391 has 4 divisors (see below), whose sum is σ = 8148471432. Its totient is φ = 8117369352.

The previous prime is 8132920381. The next prime is 8132920409. The reversal of 8132920391 is 1930292318.

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

It is a cyclic number.

It is not a de Polignac number, because 8132920391 - 2²⁶ = 8065811527 is a prime.

It is a super-2 number, since 2×8132920391² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8132920381) 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, 7774736 + ... + 7775781.

It is an arithmetic number, because the mean of its divisors is an integer number (2037117858).

Almost surely, 2^8132920391 is an apocalyptic number.

8132920391 is a deficient number, since it is larger than the sum of its proper divisors (15551041).

8132920391 is a wasteful number, since it uses less digits than its factorization.

8132920391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15551040.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 8132920391 is about 90182.7056092242. The cubic root of 8132920391 is about 2011.0159126851.

The spelling of 8132920391 in words is "eight billion, one hundred thirty-two million, nine hundred twenty thousand, three hundred ninety-one".