997615 has 4 divisors (see below), whose sum is σ = 1197144. Its totient is φ = 798088.

The previous prime is 997609. The next prime is 997627. The reversal of 997615 is 516799.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 516799 = 449 ⋅1151.

It is a cyclic number.

It is not a de Polignac number, because 997615 - 2⁵ = 997583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99757 + ... + 99766.

It is an arithmetic number, because the mean of its divisors is an integer number (299286).

2⁹⁹⁷⁶¹⁵ is an apocalyptic number.

997615 is a deficient number, since it is larger than the sum of its proper divisors (199529).

997615 is a wasteful number, since it uses less digits than its factorization.

997615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199528.

The product of its digits is 17010, while the sum is 37.

The square root of 997615 is about 998.8067881227. The cubic root of 997615 is about 99.9204367136.

Subtracting from 997615 its sum of digits (37), we obtain a triangular number (997578 = T₁₄₁₂).

The spelling of 997615 in words is "nine hundred ninety-seven thousand, six hundred fifteen".