1231992481 has 2 divisors, whose sum is σ = 1231992482. Its totient is φ = 1231992480.

The previous prime is 1231992469. The next prime is 1231992523. The reversal of 1231992481 is 1842991321.

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., 685601856 + 546390625 = 26184^2 + 23375^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231992481 - 2⁷ = 1231992353 is a prime.

It is a super-2 number, since 2×1231992481² = 3035610946481070722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1231992451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615996240 + 615996241.

It is an arithmetic number, because the mean of its divisors is an integer number (615996241).

Almost surely, 2^1231992481 is an apocalyptic number.

It is an amenable number.

1231992481 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231992481 is an equidigital number, since it uses as much as digits as its factorization.

1231992481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 40.

The square root of 1231992481 is about 35099.7504407083. The cubic root of 1231992481 is about 1072.0195013090.

The spelling of 1231992481 in words is "one billion, two hundred thirty-one million, nine hundred ninety-two thousand, four hundred eighty-one".