111081631 has 2 divisors, whose sum is σ = 111081632. Its totient is φ = 111081630.

The previous prime is 111081623. The next prime is 111081637. The reversal of 111081631 is 136180111.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 111081631 - 2³ = 111081623 is a prime.

It is a super-2 number, since 2×111081631² = 24678257491240322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111081637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55540815 + 55540816.

It is an arithmetic number, because the mean of its divisors is an integer number (55540816).

Almost surely, 2^111081631 is an apocalyptic number.

111081631 is a deficient number, since it is larger than the sum of its proper divisors (1).

111081631 is an equidigital number, since it uses as much as digits as its factorization.

111081631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 22.

The square root of 111081631 is about 10539.5270766766. The cubic root of 111081631 is about 480.7073353307.

The spelling of 111081631 in words is "one hundred eleven million, eighty-one thousand, six hundred thirty-one".