131211103997 has 2 divisors, whose sum is σ = 131211103998. Its totient is φ = 131211103996.

The previous prime is 131211103993. The next prime is 131211104027. The reversal of 131211103997 is 799301112131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 112190832601 + 19020271396 = 334949^2 + 137914^2 .

It is a cyclic number.

It is not a de Polignac number, because 131211103997 - 2² = 131211103993 is a prime.

It is a super-2 number, since 2×131211103997² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 131211103997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131211103993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65605551998 + 65605551999.

It is an arithmetic number, because the mean of its divisors is an integer number (65605551999).

Almost surely, 2^131211103997 is an apocalyptic number.

It is an amenable number.

131211103997 is a deficient number, since it is larger than the sum of its proper divisors (1).

131211103997 is an equidigital number, since it uses as much as digits as its factorization.

131211103997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10206, while the sum is 38.

The spelling of 131211103997 in words is "one hundred thirty-one billion, two hundred eleven million, one hundred three thousand, nine hundred ninety-seven".