231220212431977 has 2 divisors, whose sum is σ = 231220212431978. Its totient is φ = 231220212431976.

The previous prime is 231220212431921. The next prime is 231220212432067. The reversal of 231220212431977 is 779134212022132.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 225487343607696 + 5732868824281 = 15016236^2 + 2394341^2 .

It is a cyclic number.

It is not a de Polignac number, because 231220212431977 - 2³¹ = 231218064948329 is a prime.

It is not a weakly prime, because it can be changed into another prime (231220212231977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115610106215988 + 115610106215989.

It is an arithmetic number, because the mean of its divisors is an integer number (115610106215989).

Almost surely, 2^{231220212431977} is an apocalyptic number.

It is an amenable number.

231220212431977 is a deficient number, since it is larger than the sum of its proper divisors (1).

231220212431977 is an equidigital number, since it uses as much as digits as its factorization.

231220212431977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 508032, while the sum is 46.

The spelling of 231220212431977 in words is "two hundred thirty-one trillion, two hundred twenty billion, two hundred twelve million, four hundred thirty-one thousand, nine hundred seventy-seven".