690573797 has 2 divisors, whose sum is σ = 690573798. Its totient is φ = 690573796.

The previous prime is 690573743. The next prime is 690573833. The reversal of 690573797 is 797375096.

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., 685968481 + 4605316 = 26191^2 + 2146^2 .

It is a cyclic number.

It is not a de Polignac number, because 690573797 - 2⁶ = 690573733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (690573707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345286898 + 345286899.

It is an arithmetic number, because the mean of its divisors is an integer number (345286899).

Almost surely, 2^690573797 is an apocalyptic number.

It is an amenable number.

690573797 is a deficient number, since it is larger than the sum of its proper divisors (1).

690573797 is an equidigital number, since it uses as much as digits as its factorization.

690573797 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2500470, while the sum is 53.

The square root of 690573797 is about 26278.7708426403. The cubic root of 690573797 is about 883.9004707154.

The spelling of 690573797 in words is "six hundred ninety million, five hundred seventy-three thousand, seven hundred ninety-seven".