131004391 has 8 divisors (see below), whose sum is σ = 152775200. Its totient is φ = 112289184.

The previous prime is 131004337. The next prime is 131004421. The reversal of 131004391 is 193400131.

It is not a de Polignac number, because 131004391 - 2¹¹ = 131002343 is a prime.

It is a super-2 number, since 2×131004391² = 34324300922561762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131004311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 190626 + ... + 191311.

It is an arithmetic number, because the mean of its divisors is an integer number (19096900).

Almost surely, 2^131004391 is an apocalyptic number.

131004391 is a deficient number, since it is larger than the sum of its proper divisors (21770809).

131004391 is an frugal number, since it uses more digits than its factorization.

131004391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381958 (or 381944 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 131004391 is about 11445.7149623778. The cubic root of 131004391 is about 507.8809822549.

The spelling of 131004391 in words is "one hundred thirty-one million, four thousand, three hundred ninety-one".