290207386681 has 3 divisors (see below), whose sum is σ = 290207925391. Its totient is φ = 290206847972.

The previous prime is 290207386619. The next prime is 290207386709. The reversal of 290207386681 is 186683702092.

The square root of 290207386681 is 538709.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 187410202281 + 102797184400 = 432909^2 + 320620^2 .

It is not a de Polignac number, because 290207386681 - 2⁹ = 290207386169 is a prime.

It is a super-2 number, since 2×290207386681² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (290207386081) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 269355 + ... + 808063.

Almost surely, 2^290207386681 is an apocalyptic number.

290207386681 is the 538709-th square number.

290207386681 is the 269355-th centered octagonal number.

It is an amenable number.

290207386681 is a deficient number, since it is larger than the sum of its proper divisors (538710).

290207386681 is an frugal number, since it uses more digits than its factorization.

290207386681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1077418 (or 538709 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 52.

The spelling of 290207386681 in words is "two hundred ninety billion, two hundred seven million, three hundred eighty-six thousand, six hundred eighty-one".