69681631 has 2 divisors, whose sum is σ = 69681632. Its totient is φ = 69681630.

The previous prime is 69681613. The next prime is 69681637. The reversal of 69681631 is 13618696.

Together with previous prime (69681613) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 69681631 - 2²¹ = 67584479 is a prime.

It is a super-2 number, since 2×69681631² = 9711059397640322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (69681637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34840815 + 34840816.

It is an arithmetic number, because the mean of its divisors is an integer number (34840816).

Almost surely, 2^69681631 is an apocalyptic number.

69681631 is a deficient number, since it is larger than the sum of its proper divisors (1).

69681631 is an equidigital number, since it uses as much as digits as its factorization.

69681631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 40.

The square root of 69681631 is about 8347.5523957625. The cubic root of 69681631 is about 411.5027758356.

The spelling of 69681631 in words is "sixty-nine million, six hundred eighty-one thousand, six hundred thirty-one".