775172131 has 2 divisors, whose sum is σ = 775172132. Its totient is φ = 775172130.

The previous prime is 775172113. The next prime is 775172141. The reversal of 775172131 is 131271577.

It is a happy number.

Together with previous prime (775172113) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 775172131 - 2¹¹ = 775170083 is a prime.

It is a super-2 number, since 2×775172131² = 1201783665358162322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (775172141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 387586065 + 387586066.

It is an arithmetic number, because the mean of its divisors is an integer number (387586066).

Almost surely, 2^775172131 is an apocalyptic number.

775172131 is a deficient number, since it is larger than the sum of its proper divisors (1).

775172131 is an equidigital number, since it uses as much as digits as its factorization.

775172131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10290, while the sum is 34.

The square root of 775172131 is about 27841.9132065309. The cubic root of 775172131 is about 918.6132743243.

The spelling of 775172131 in words is "seven hundred seventy-five million, one hundred seventy-two thousand, one hundred thirty-one".