6172291381 has 2 divisors, whose sum is σ = 6172291382. Its totient is φ = 6172291380.

The previous prime is 6172291297. The next prime is 6172291441. The reversal of 6172291381 is 1831922716.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5050376356 + 1121915025 = 71066^2 + 33495^2 .

It is a cyclic number.

It is not a de Polignac number, because 6172291381 - 2⁷ = 6172291253 is a prime.

It is a super-2 number, since 2×6172291381² = 76194361783933774322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6172291981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3086145690 + 3086145691.

It is an arithmetic number, because the mean of its divisors is an integer number (3086145691).

Almost surely, 2^6172291381 is an apocalyptic number.

It is an amenable number.

6172291381 is a deficient number, since it is larger than the sum of its proper divisors (1).

6172291381 is an equidigital number, since it uses as much as digits as its factorization.

6172291381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 40.

The square root of 6172291381 is about 78563.9318071594. The cubic root of 6172291381 is about 1834.3497294732.

The spelling of 6172291381 in words is "six billion, one hundred seventy-two million, two hundred ninety-one thousand, three hundred eighty-one".