1001023997 has 2 divisors, whose sum is σ = 1001023998. Its totient is φ = 1001023996.

The previous prime is 1001023967. The next prime is 1001024021. The reversal of 1001023997 is 7993201001.

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., 999887641 + 1136356 = 31621^2 + 1066^2 .

It is a cyclic number.

It is not a de Polignac number, because 1001023997 - 2²⁰ = 999975421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1001023927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500511998 + 500511999.

It is an arithmetic number, because the mean of its divisors is an integer number (500511999).

Almost surely, 2^1001023997 is an apocalyptic number.

It is an amenable number.

1001023997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001023997 is an equidigital number, since it uses as much as digits as its factorization.

1001023997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3402, while the sum is 32.

The square root of 1001023997 is about 31638.9632731542. The cubic root of 1001023997 is about 1000.3412158918.

Adding to 1001023997 its reverse (7993201001), we get a palindrome (8994224998).

The spelling of 1001023997 in words is "one billion, one million, twenty-three thousand, nine hundred ninety-seven".