997275221 has 4 divisors (see below), whose sum is σ = 1020467712. Its totient is φ = 974082732.

The previous prime is 997275217. The next prime is 997275263. The reversal of 997275221 is 122572799.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 122572799 = 509 ⋅240811.

It is a cyclic number.

It is not a de Polignac number, because 997275221 - 2² = 997275217 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997275271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11596181 + ... + 11596266.

It is an arithmetic number, because the mean of its divisors is an integer number (255116928).

Almost surely, 2^997275221 is an apocalyptic number.

It is an amenable number.

997275221 is a deficient number, since it is larger than the sum of its proper divisors (23192491).

997275221 is a wasteful number, since it uses less digits than its factorization.

997275221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23192490.

The product of its digits is 158760, while the sum is 44.

The square root of 997275221 is about 31579.6646752305. The cubic root of 997275221 is about 999.0909141467.

The spelling of 997275221 in words is "nine hundred ninety-seven million, two hundred seventy-five thousand, two hundred twenty-one".