131147921 has 2 divisors, whose sum is σ = 131147922. Its totient is φ = 131147920.

The previous prime is 131147903. The next prime is 131147923. The reversal of 131147921 is 129741131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 100500625 + 30647296 = 10025^2 + 5536^2 .

It is a cyclic number.

It is not a de Polignac number, because 131147921 - 2⁶ = 131147857 is a prime.

It is a Sophie Germain prime.

Together with 131147923, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (131147923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65573960 + 65573961.

It is an arithmetic number, because the mean of its divisors is an integer number (65573961).

Almost surely, 2^131147921 is an apocalyptic number.

It is an amenable number.

131147921 is a deficient number, since it is larger than the sum of its proper divisors (1).

131147921 is an equidigital number, since it uses as much as digits as its factorization.

131147921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1512, while the sum is 29.

The square root of 131147921 is about 11451.9832780178. The cubic root of 131147921 is about 508.0663947464.

The spelling of 131147921 in words is "one hundred thirty-one million, one hundred forty-seven thousand, nine hundred twenty-one".