997000691 has 2 divisors, whose sum is σ = 997000692. Its totient is φ = 997000690.

The previous prime is 997000681. The next prime is 997000723. The reversal of 997000691 is 196000799.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (196000799) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-997000691 is a prime.

It is not a weakly prime, because it can be changed into another prime (997000681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498500345 + 498500346.

It is an arithmetic number, because the mean of its divisors is an integer number (498500346).

Almost surely, 2^997000691 is an apocalyptic number.

997000691 is a deficient number, since it is larger than the sum of its proper divisors (1).

997000691 is an equidigital number, since it uses as much as digits as its factorization.

997000691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30618, while the sum is 41.

The square root of 997000691 is about 31575.3177497868. The cubic root of 997000691 is about 998.9992291251. Note that the first 3 decimals are identical.

The spelling of 997000691 in words is "nine hundred ninety-seven million, six hundred ninety-one", and thus it is an aban number.