998072531 has 2 divisors, whose sum is σ = 998072532. Its totient is φ = 998072530.

The previous prime is 998072513. The next prime is 998072539. The reversal of 998072531 is 135270899.

Together with previous prime (998072513) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 998072531 - 2²⁶ = 930963667 is a prime.

It is a super-2 number, since 2×998072531² = 1992297554273491922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (998072539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499036265 + 499036266.

It is an arithmetic number, because the mean of its divisors is an integer number (499036266).

Almost surely, 2^998072531 is an apocalyptic number.

998072531 is a deficient number, since it is larger than the sum of its proper divisors (1).

998072531 is an equidigital number, since it uses as much as digits as its factorization.

998072531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 136080, while the sum is 44.

The square root of 998072531 is about 31592.2859413497. The cubic root of 998072531 is about 999.3570970978.

The spelling of 998072531 in words is "nine hundred ninety-eight million, seventy-two thousand, five hundred thirty-one".