662191631 has 2 divisors, whose sum is σ = 662191632. Its totient is φ = 662191630.

The previous prime is 662191613. The next prime is 662191681. The reversal of 662191631 is 136191266.

Together with previous prime (662191613) 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 662191631 - 2⁶ = 662191567 is a prime.

It is a super-2 number, since 2×662191631² = 876995512332880322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 662191591 and 662191600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (662191681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331095815 + 331095816.

It is an arithmetic number, because the mean of its divisors is an integer number (331095816).

Almost surely, 2^662191631 is an apocalyptic number.

662191631 is a deficient number, since it is larger than the sum of its proper divisors (1).

662191631 is an equidigital number, since it uses as much as digits as its factorization.

662191631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11664, while the sum is 35.

The square root of 662191631 is about 25733.0843662395. The cubic root of 662191631 is about 871.6214229159.

The spelling of 662191631 in words is "six hundred sixty-two million, one hundred ninety-one thousand, six hundred thirty-one".