1031998997 has 2 divisors, whose sum is σ = 1031998998. Its totient is φ = 1031998996.

The previous prime is 1031998993. The next prime is 1031998999. The reversal of 1031998997 is 7998991301.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1008126001 + 23872996 = 31751^2 + 4886^2 .

It is a cyclic number.

It is not a de Polignac number, because 1031998997 - 2² = 1031998993 is a prime.

Together with 1031998999, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1031998993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 515999498 + 515999499.

It is an arithmetic number, because the mean of its divisors is an integer number (515999499).

Almost surely, 2^1031998997 is an apocalyptic number.

It is an amenable number.

1031998997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1031998997 is an equidigital number, since it uses as much as digits as its factorization.

1031998997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1102248, while the sum is 56.

The square root of 1031998997 is about 32124.7411974011. The cubic root of 1031998997 is about 1010.5545420558.

The spelling of 1031998997 in words is "one billion, thirty-one million, nine hundred ninety-eight thousand, nine hundred ninety-seven".