997151999 has 2 divisors, whose sum is σ = 997152000. Its totient is φ = 997151998.

The previous prime is 997151989. The next prime is 997152001. The reversal of 997151999 is 999151799.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-997151999 is a prime.

Together with 997152001, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997151989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498575999 + 498576000.

It is an arithmetic number, because the mean of its divisors is an integer number (498576000).

Almost surely, 2^997151999 is an apocalyptic number.

997151999 is a deficient number, since it is larger than the sum of its proper divisors (1).

997151999 is an equidigital number, since it uses as much as digits as its factorization.

997151999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2066715, while the sum is 59.

The square root of 997151999 is about 31577.7136442777. The cubic root of 997151999 is about 999.0497636703.

The spelling of 997151999 in words is "nine hundred ninety-seven million, one hundred fifty-one thousand, nine hundred ninety-nine".