690289381 has 2 divisors, whose sum is σ = 690289382. Its totient is φ = 690289380.

The previous prime is 690289367. The next prime is 690289393. The reversal of 690289381 is 183982096.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 531302500 + 158986881 = 23050^2 + 12609^2 .

It is a cyclic number.

It is not a de Polignac number, because 690289381 - 2⁷ = 690289253 is a prime.

It is a super-2 number, since 2×690289381² = 952998859042726322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (690286381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345144690 + 345144691.

It is an arithmetic number, because the mean of its divisors is an integer number (345144691).

Almost surely, 2^690289381 is an apocalyptic number.

It is an amenable number.

690289381 is a deficient number, since it is larger than the sum of its proper divisors (1).

690289381 is an equidigital number, since it uses as much as digits as its factorization.

690289381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 186624, while the sum is 46.

The square root of 690289381 is about 26273.3587689127. The cubic root of 690289381 is about 883.7791078921.

The spelling of 690289381 in words is "six hundred ninety million, two hundred eighty-nine thousand, three hundred eighty-one".