997976659 has 2 divisors, whose sum is σ = 997976660. Its totient is φ = 997976658.

The previous prime is 997976633. The next prime is 997976663. The reversal of 997976659 is 956679799.

It is a strong prime.

It is an emirp because it is prime and its reverse (956679799) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 997976659 - 2⁵ = 997976627 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 997976594 and 997976603.

It is not a weakly prime, because it can be changed into another prime (997976699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498988329 + 498988330.

It is an arithmetic number, because the mean of its divisors is an integer number (498988330).

Almost surely, 2^997976659 is an apocalyptic number.

997976659 is a deficient number, since it is larger than the sum of its proper divisors (1).

997976659 is an equidigital number, since it uses as much as digits as its factorization.

997976659 is an evil number, because the sum of its binary digits is even.

The product of its digits is 57868020, while the sum is 67.

The square root of 997976659 is about 31590.7685724802. The cubic root of 997976659 is about 999.3250976092.

The spelling of 997976659 in words is "nine hundred ninety-seven million, nine hundred seventy-six thousand, six hundred fifty-nine".