920890692581 has 2 divisors, whose sum is σ = 920890692582. Its totient is φ = 920890692580.

The previous prime is 920890692541. The next prime is 920890692583. The reversal of 920890692581 is 185296098029.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 896684000356 + 24206692225 = 946934^2 + 155585^2 .

It is a cyclic number.

It is not a de Polignac number, because 920890692581 - 2¹⁸ = 920890430437 is a prime.

It is a super-2 number, since 2×920890692581² (a number of 25 digits) contains 22 as substring.

Together with 920890692583, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 920890692581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (920890692583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460445346290 + 460445346291.

It is an arithmetic number, because the mean of its divisors is an integer number (460445346291).

Almost surely, 2^920890692581 is an apocalyptic number.

It is an amenable number.

920890692581 is a deficient number, since it is larger than the sum of its proper divisors (1).

920890692581 is an equidigital number, since it uses as much as digits as its factorization.

920890692581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5598720, while the sum is 59.

The spelling of 920890692581 in words is "nine hundred twenty billion, eight hundred ninety million, six hundred ninety-two thousand, five hundred eighty-one".