131121929 has 2 divisors, whose sum is σ = 131121930. Its totient is φ = 131121928.

The previous prime is 131121883. The next prime is 131121953. The reversal of 131121929 is 929121131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 96040000 + 35081929 = 9800^2 + 5923^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131121929 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (131121959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65560964 + 65560965.

It is an arithmetic number, because the mean of its divisors is an integer number (65560965).

Almost surely, 2^131121929 is an apocalyptic number.

It is an amenable number.

131121929 is a deficient number, since it is larger than the sum of its proper divisors (1).

131121929 is an equidigital number, since it uses as much as digits as its factorization.

131121929 is an evil number, because the sum of its binary digits is even.

The product of its digits is 972, while the sum is 29.

The square root of 131121929 is about 11450.8483965163. The cubic root of 131121929 is about 508.0328282358.

The spelling of 131121929 in words is "one hundred thirty-one million, one hundred twenty-one thousand, nine hundred twenty-nine".