1020198997 has 2 divisors, whose sum is σ = 1020198998. Its totient is φ = 1020198996.

The previous prime is 1020198983. The next prime is 1020199003. The reversal of 1020198997 is 7998910201.

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., 1009269361 + 10929636 = 31769^2 + 3306^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020198997 - 2²³ = 1011810389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1020198397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510099498 + 510099499.

It is an arithmetic number, because the mean of its divisors is an integer number (510099499).

Almost surely, 2^1020198997 is an apocalyptic number.

It is an amenable number.

1020198997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020198997 is an equidigital number, since it uses as much as digits as its factorization.

1020198997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 46.

The square root of 1020198997 is about 31940.5541122880. The cubic root of 1020198997 is about 1006.6881676888.

The spelling of 1020198997 in words is "one billion, twenty million, one hundred ninety-eight thousand, nine hundred ninety-seven".