181374627187631 has 2 divisors, whose sum is σ = 181374627187632. Its totient is φ = 181374627187630.

The previous prime is 181374627187613. The next prime is 181374627187651. The reversal of 181374627187631 is 136781726473181.

Together with previous prime (181374627187613) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 181374627187631 - 2⁴² = 176976580676527 is a prime.

It is a super-2 number, since 2×181374627187631² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (181374627187651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90687313593815 + 90687313593816.

It is an arithmetic number, because the mean of its divisors is an integer number (90687313593816).

Almost surely, 2^{181374627187631} is an apocalyptic number.

181374627187631 is a deficient number, since it is larger than the sum of its proper divisors (1).

181374627187631 is an equidigital number, since it uses as much as digits as its factorization.

181374627187631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56899584, while the sum is 65.

The spelling of 181374627187631 in words is "one hundred eighty-one trillion, three hundred seventy-four billion, six hundred twenty-seven million, one hundred eighty-seven thousand, six hundred thirty-one".