8139195412 has 6 divisors (see below), whose sum is σ = 14243591978. Its totient is φ = 4069597704.

The previous prime is 8139195391. The next prime is 8139195469. The reversal of 8139195412 is 2145919318.

It can be written as a sum of positive squares in only one way, i.e., 7934533776 + 204661636 = 89076^2 + 14306^2 .

It is a super-3 number, since 3×8139195412³ (a number of 31 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1017399423 + ... + 1017399430.

Almost surely, 2^8139195412 is an apocalyptic number.

It is an amenable number.

8139195412 is a deficient number, since it is larger than the sum of its proper divisors (6104396566).

8139195412 is a wasteful number, since it uses less digits than its factorization.

8139195412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2034798857 (or 2034798855 counting only the distinct ones).

The product of its digits is 77760, while the sum is 43.

The square root of 8139195412 is about 90217.4895017590. The cubic root of 8139195412 is about 2011.5329849623.

The spelling of 8139195412 in words is "eight billion, one hundred thirty-nine million, one hundred ninety-five thousand, four hundred twelve".