997972487 has 2 divisors, whose sum is σ = 997972488. Its totient is φ = 997972486.

The previous prime is 997972441. The next prime is 997972489. The reversal of 997972487 is 784279799.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-997972487 is a prime.

Together with 997972489, 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 (997972489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498986243 + 498986244.

It is an arithmetic number, because the mean of its divisors is an integer number (498986244).

Almost surely, 2^997972487 is an apocalyptic number.

997972487 is a deficient number, since it is larger than the sum of its proper divisors (1).

997972487 is an equidigital number, since it uses as much as digits as its factorization.

997972487 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16003008, while the sum is 62.

The square root of 997972487 is about 31590.7025404628. The cubic root of 997972487 is about 999.3237050616.

The spelling of 997972487 in words is "nine hundred ninety-seven million, nine hundred seventy-two thousand, four hundred eighty-seven".