690948613 has 2 divisors, whose sum is σ = 690948614. Its totient is φ = 690948612.

The previous prime is 690948593. The next prime is 690948631. The reversal of 690948613 is 316849096.

Together with next prime (690948631) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 670136769 + 20811844 = 25887^2 + 4562^2 .

It is a cyclic number.

It is not a de Polignac number, because 690948613 - 2¹⁷ = 690817541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (690948653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345474306 + 345474307.

It is an arithmetic number, because the mean of its divisors is an integer number (345474307).

Almost surely, 2^690948613 is an apocalyptic number.

It is an amenable number.

690948613 is a deficient number, since it is larger than the sum of its proper divisors (1).

690948613 is an equidigital number, since it uses as much as digits as its factorization.

690948613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 279936, while the sum is 46.

The square root of 690948613 is about 26285.9014112128. The cubic root of 690948613 is about 884.0603571362.

The spelling of 690948613 in words is "six hundred ninety million, nine hundred forty-eight thousand, six hundred thirteen".