131128471897 has 2 divisors, whose sum is σ = 131128471898. Its totient is φ = 131128471896.

The previous prime is 131128471841. The next prime is 131128471919. The reversal of 131128471897 is 798174821131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 126895538176 + 4232933721 = 356224^2 + 65061^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131128471897 is a prime.

It is a super-2 number, since 2×131128471897² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (131128471597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65564235948 + 65564235949.

It is an arithmetic number, because the mean of its divisors is an integer number (65564235949).

Almost surely, 2^131128471897 is an apocalyptic number.

It is an amenable number.

131128471897 is a deficient number, since it is larger than the sum of its proper divisors (1).

131128471897 is an equidigital number, since it uses as much as digits as its factorization.

131128471897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 677376, while the sum is 52.

The spelling of 131128471897 in words is "one hundred thirty-one billion, one hundred twenty-eight million, four hundred seventy-one thousand, eight hundred ninety-seven".