997447649 has 12 divisors (see below), whose sum is σ = 1102133760. Its totient is φ = 902002200.

The previous prime is 997447639. The next prime is 997447657. The reversal of 997447649 is 946744799.

It is not a de Polignac number, because 997447649 - 2²⁴ = 980670433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (997447609) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1532 + ... + 44690.

It is an arithmetic number, because the mean of its divisors is an integer number (91844480).

Almost surely, 2^997447649 is an apocalyptic number.

It is an amenable number.

997447649 is a deficient number, since it is larger than the sum of its proper divisors (104686111).

997447649 is a wasteful number, since it uses less digits than its factorization.

997447649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43372 (or 43361 counting only the distinct ones).

The product of its digits is 13716864, while the sum is 59.

The square root of 997447649 is about 31582.3946052227. The cubic root of 997447649 is about 999.1484914724.

The spelling of 997447649 in words is "nine hundred ninety-seven million, four hundred forty-seven thousand, six hundred forty-nine".