131201775 has 84 divisors (see below), whose sum is σ = 255342288. Its totient is φ = 66718080.

The previous prime is 131201773. The next prime is 131201813. The reversal of 131201775 is 577102131.

It is a happy number.

It is not a de Polignac number, because 131201775 - 2¹ = 131201773 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131201773) by changing a digit.

It is a polite number, since it can be written in 83 ways as a sum of consecutive naturals, for example, 419019 + ... + 419331.

Almost surely, 2^131201775 is an apocalyptic number.

131201775 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

131201775 is a deficient number, since it is larger than the sum of its proper divisors (124140513).

131201775 is an equidigital number, since it uses as much as digits as its factorization.

131201775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364 (or 344 counting only the distinct ones).

The product of its (nonzero) digits is 1470, while the sum is 27.

The square root of 131201775 is about 11454.3343324700. The cubic root of 131201775 is about 508.1359286058.

The spelling of 131201775 in words is "one hundred thirty-one million, two hundred one thousand, seven hundred seventy-five".