997191627 has 48 divisors (see below), whose sum is σ = 1477701792. Its totient is φ = 595701760.

The previous prime is 997191599. The next prime is 997191647. The reversal of 997191627 is 726191799.

It is a happy number.

It is not a de Polignac number, because 997191627 - 2⁷ = 997191499 is a prime.

It is a super-2 number, since 2×997191627² = 1988782281917814258, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a self number, because there is not a number n which added to its sum of digits gives 997191627.

It is not an unprimeable number, because it can be changed into a prime (997191647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7278703 + ... + 7278839.

It is an arithmetic number, because the mean of its divisors is an integer number (30785454).

Almost surely, 2^997191627 is an apocalyptic number.

997191627 is a deficient number, since it is larger than the sum of its proper divisors (480510165).

997191627 is a wasteful number, since it uses less digits than its factorization.

997191627 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316 (or 257 counting only the distinct ones).

The product of its digits is 428652, while the sum is 51.

The square root of 997191627 is about 31578.3411058909. The cubic root of 997191627 is about 999.0629979681.

The spelling of 997191627 in words is "nine hundred ninety-seven million, one hundred ninety-one thousand, six hundred twenty-seven".