131908128949 has 2 divisors, whose sum is σ = 131908128950. Its totient is φ = 131908128948.

The previous prime is 131908128893. The next prime is 131908128973. The reversal of 131908128949 is 949821809131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 113414032900 + 18494096049 = 336770^2 + 135993^2 .

It is a cyclic number.

It is not a de Polignac number, because 131908128949 - 2¹⁵ = 131908096181 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 131908128949.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131908128049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65954064474 + 65954064475.

It is an arithmetic number, because the mean of its divisors is an integer number (65954064475).

Almost surely, 2^131908128949 is an apocalyptic number.

It is an amenable number.

131908128949 is a deficient number, since it is larger than the sum of its proper divisors (1).

131908128949 is an equidigital number, since it uses as much as digits as its factorization.

131908128949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1119744, while the sum is 55.

The spelling of 131908128949 in words is "one hundred thirty-one billion, nine hundred eight million, one hundred twenty-eight thousand, nine hundred forty-nine".