645092797 has 2 divisors, whose sum is σ = 645092798. Its totient is φ = 645092796.

The previous prime is 645092783. The next prime is 645092801. The reversal of 645092797 is 797290546.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 597606916 + 47485881 = 24446^2 + 6891^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-645092797 is a prime.

It is a super-2 number, since 2×645092797² = 832289433482566418, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 645092797.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645092197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322546398 + 322546399.

It is an arithmetic number, because the mean of its divisors is an integer number (322546399).

Almost surely, 2^645092797 is an apocalyptic number.

It is an amenable number.

645092797 is a deficient number, since it is larger than the sum of its proper divisors (1).

645092797 is an equidigital number, since it uses as much as digits as its factorization.

645092797 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 952560, while the sum is 49.

The square root of 645092797 is about 25398.6770718477. The cubic root of 645092797 is about 864.0536933117.

The spelling of 645092797 in words is "six hundred forty-five million, ninety-two thousand, seven hundred ninety-seven".