997415621 has 8 divisors (see below), whose sum is σ = 1052486400. Its totient is φ = 942602400.

The previous prime is 997415609. The next prime is 997415681. The reversal of 997415621 is 126514799.

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 997415621 - 2²⁶ = 930306757 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997415681) 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, 56405 + ... + 71946.

It is an arithmetic number, because the mean of its divisors is an integer number (131560800).

Almost surely, 2^997415621 is an apocalyptic number.

It is an amenable number.

997415621 is a deficient number, since it is larger than the sum of its proper divisors (55070779).

997415621 is a wasteful number, since it uses less digits than its factorization.

997415621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128779.

The product of its digits is 136080, while the sum is 44.

The square root of 997415621 is about 31581.8875465036. The cubic root of 997415621 is about 999.1377971532.

The spelling of 997415621 in words is "nine hundred ninety-seven million, four hundred fifteen thousand, six hundred twenty-one".