1023657997 has 2 divisors, whose sum is σ = 1023657998. Its totient is φ = 1023657996.

The previous prime is 1023657977. The next prime is 1023658039. The reversal of 1023657997 is 7997563201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 745235401 + 278422596 = 27299^2 + 16686^2 .

It is a cyclic number.

It is not a de Polignac number, because 1023657997 - 2²⁷ = 889440269 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1023657997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1023657917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 511828998 + 511828999.

It is an arithmetic number, because the mean of its divisors is an integer number (511828999).

Almost surely, 2^1023657997 is an apocalyptic number.

It is an amenable number.

1023657997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1023657997 is an equidigital number, since it uses as much as digits as its factorization.

1023657997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 714420, while the sum is 49.

The square root of 1023657997 is about 31994.6557568604. The cubic root of 1023657997 is about 1007.8246147182.

The spelling of 1023657997 in words is "one billion, twenty-three million, six hundred fifty-seven thousand, nine hundred ninety-seven".