131022581 has 2 divisors, whose sum is σ = 131022582. Its totient is φ = 131022580.

The previous prime is 131022547. The next prime is 131022599. The reversal of 131022581 is 185220131.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 130736356 + 286225 = 11434^2 + 535^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131022581 is a prime.

It is a super-2 number, since 2×131022581² = 34333833463803122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131022481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65511290 + 65511291.

It is an arithmetic number, because the mean of its divisors is an integer number (65511291).

Almost surely, 2^131022581 is an apocalyptic number.

It is an amenable number.

131022581 is a deficient number, since it is larger than the sum of its proper divisors (1).

131022581 is an equidigital number, since it uses as much as digits as its factorization.

131022581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 131022581 is about 11446.5095553186. The cubic root of 131022581 is about 507.9044876439.

The spelling of 131022581 in words is "one hundred thirty-one million, twenty-two thousand, five hundred eighty-one".