131420981 has 2 divisors, whose sum is σ = 131420982. Its totient is φ = 131420980.

The previous prime is 131420959. The next prime is 131420983. The reversal of 131420981 is 189024131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129185956 + 2235025 = 11366^2 + 1495^2 .

It is an emirp because it is prime and its reverse (189024131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 131420981 - 2⁶ = 131420917 is a prime.

It is a super-2 number, since 2×131420981² = 34542948494004722, which contains 22 as substring.

Together with 131420983, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131420983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65710490 + 65710491.

It is an arithmetic number, because the mean of its divisors is an integer number (65710491).

Almost surely, 2^131420981 is an apocalyptic number.

It is an amenable number.

131420981 is a deficient number, since it is larger than the sum of its proper divisors (1).

131420981 is an equidigital number, since it uses as much as digits as its factorization.

131420981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 131420981 is about 11463.8990313069. The cubic root of 131420981 is about 508.4187613361.

The spelling of 131420981 in words is "one hundred thirty-one million, four hundred twenty thousand, nine hundred eighty-one".