997156747 has 8 divisors (see below), whose sum is σ = 1022870016. Its totient is φ = 971630952.

The previous prime is 997156733. The next prime is 997156753. The reversal of 997156747 is 747651799.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 997156747 - 2¹⁵ = 997123979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (997156247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36063 + ... + 57400.

It is an arithmetic number, because the mean of its divisors is an integer number (127858752).

Almost surely, 2^997156747 is an apocalyptic number.

997156747 is a deficient number, since it is larger than the sum of its proper divisors (25713269).

997156747 is a wasteful number, since it uses less digits than its factorization.

997156747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93737.

The product of its digits is 3333960, while the sum is 55.

The square root of 997156747 is about 31577.7888237920. The cubic root of 997156747 is about 999.0513493465.

The spelling of 997156747 in words is "nine hundred ninety-seven million, one hundred fifty-six thousand, seven hundred forty-seven".