373689581 has 2 divisors, whose sum is σ = 373689582. Its totient is φ = 373689580.

The previous prime is 373689577. The next prime is 373689583. The reversal of 373689581 is 185986373.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 343768681 + 29920900 = 18541^2 + 5470^2 .

It is a cyclic number.

It is not a de Polignac number, because 373689581 - 2² = 373689577 is a prime.

It is a super-2 number, since 2×373689581² = 279287805895911122, which contains 22 as substring.

Together with 373689583, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (373689583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 186844790 + 186844791.

It is an arithmetic number, because the mean of its divisors is an integer number (186844791).

Almost surely, 2^373689581 is an apocalyptic number.

It is an amenable number.

373689581 is a deficient number, since it is larger than the sum of its proper divisors (1).

373689581 is an equidigital number, since it uses as much as digits as its factorization.

373689581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1088640, while the sum is 50.

The square root of 373689581 is about 19331.0522476145. The cubic root of 373689581 is about 720.2838265001.

The spelling of 373689581 in words is "three hundred seventy-three million, six hundred eighty-nine thousand, five hundred eighty-one".