997879537 has 2 divisors, whose sum is σ = 997879538. Its totient is φ = 997879536.

The previous prime is 997879523. The next prime is 997879591. The reversal of 997879537 is 735978799.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 805197376 + 192682161 = 28376^2 + 13881^2 .

It is a cyclic number.

It is not a de Polignac number, because 997879537 - 2⁷ = 997879409 is a prime.

It is not a weakly prime, because it can be changed into another prime (997879517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498939768 + 498939769.

It is an arithmetic number, because the mean of its divisors is an integer number (498939769).

Almost surely, 2^997879537 is an apocalyptic number.

It is an amenable number.

997879537 is a deficient number, since it is larger than the sum of its proper divisors (1).

997879537 is an equidigital number, since it uses as much as digits as its factorization.

997879537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30005640, while the sum is 64.

The square root of 997879537 is about 31589.2313455076. The cubic root of 997879537 is about 999.2926788147.

The spelling of 997879537 in words is "nine hundred ninety-seven million, eight hundred seventy-nine thousand, five hundred thirty-seven".