131019881 has 2 divisors, whose sum is σ = 131019882. Its totient is φ = 131019880.

The previous prime is 131019851. The next prime is 131019949. The reversal of 131019881 is 188910131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 125798656 + 5221225 = 11216^2 + 2285^2 .

It is an emirp because it is prime and its reverse (188910131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 131019881 - 2¹⁴ = 131003497 is a prime.

It is a super-2 number, since 2×131019881² = 34332418434508322, which contains 22 as substring.

It is a Chen prime.

It is equal to p_7432763 and since 131019881 and 7432763 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (131019851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65509940 + 65509941.

It is an arithmetic number, because the mean of its divisors is an integer number (65509941).

Almost surely, 2^131019881 is an apocalyptic number.

It is an amenable number.

131019881 is a deficient number, since it is larger than the sum of its proper divisors (1).

131019881 is an equidigital number, since it uses as much as digits as its factorization.

131019881 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 32.

The square root of 131019881 is about 11446.3916148278. The cubic root of 131019881 is about 507.9009988012.

The spelling of 131019881 in words is "one hundred thirty-one million, nineteen thousand, eight hundred eighty-one".