127831511881 has 2 divisors, whose sum is σ = 127831511882. Its totient is φ = 127831511880.

The previous prime is 127831511783. The next prime is 127831511887. The reversal of 127831511881 is 188115138721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119381306256 + 8450205625 = 345516^2 + 91925^2 .

It is a cyclic number.

It is not a de Polignac number, because 127831511881 - 2¹¹ = 127831509833 is a prime.

It is a super-2 number, since 2×127831511881² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (127831511887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63915755940 + 63915755941.

It is an arithmetic number, because the mean of its divisors is an integer number (63915755941).

Almost surely, 2^127831511881 is an apocalyptic number.

It is an amenable number.

127831511881 is a deficient number, since it is larger than the sum of its proper divisors (1).

127831511881 is an equidigital number, since it uses as much as digits as its factorization.

127831511881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 107520, while the sum is 46.

The spelling of 127831511881 in words is "one hundred twenty-seven billion, eight hundred thirty-one million, five hundred eleven thousand, eight hundred eighty-one".