8190715397 has 4 divisors (see below), whose sum is σ = 8192650956. Its totient is φ = 8188779840.

The previous prime is 8190715381. The next prime is 8190715399. The reversal of 8190715397 is 7935170918.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6259024996 + 1931690401 = 79114^2 + 43951^2 .

It is a cyclic number.

It is not a de Polignac number, because 8190715397 - 2⁴ = 8190715381 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 (8190715399) 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, 961418 + ... + 969899.

It is an arithmetic number, because the mean of its divisors is an integer number (2048162739).

Almost surely, 2^8190715397 is an apocalyptic number.

It is an amenable number.

8190715397 is a deficient number, since it is larger than the sum of its proper divisors (1935559).

8190715397 is a wasteful number, since it uses less digits than its factorization.

8190715397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1935558.

The product of its (nonzero) digits is 476280, while the sum is 50.

The square root of 8190715397 is about 90502.5712176179. The cubic root of 8190715397 is about 2015.7683033365.

The spelling of 8190715397 in words is "eight billion, one hundred ninety million, seven hundred fifteen thousand, three hundred ninety-seven".