690021131 has 2 divisors, whose sum is σ = 690021132. Its totient is φ = 690021130.

The previous prime is 690021113. The next prime is 690021139. The reversal of 690021131 is 131120096.

It is a happy number.

Together with previous prime (690021113) 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 690021131 - 2⁶ = 690021067 is a prime.

It is a super-2 number, since 2×690021131² = 952258322453038322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 690021097 and 690021106.

It is not a weakly prime, because it can be changed into another prime (690021139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345010565 + 345010566.

It is an arithmetic number, because the mean of its divisors is an integer number (345010566).

Almost surely, 2^690021131 is an apocalyptic number.

690021131 is a deficient number, since it is larger than the sum of its proper divisors (1).

690021131 is an equidigital number, since it uses as much as digits as its factorization.

690021131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 690021131 is about 26268.2532917589. The cubic root of 690021131 is about 883.6646126924.

The spelling of 690021131 in words is "six hundred ninety million, twenty-one thousand, one hundred thirty-one".