997478901 has 16 divisors (see below), whose sum is σ = 1478297920. Its totient is φ = 664737840.

The previous prime is 997478899. The next prime is 997478903. The reversal of 997478901 is 109874799.

It is an interprime number because it is at equal distance from previous prime (997478899) and next prime (997478903).

It is not a de Polignac number, because 997478901 - 2¹ = 997478899 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 (997478903) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93291 + ... + 103431.

It is an arithmetic number, because the mean of its divisors is an integer number (92393620).

Almost surely, 2^997478901 is an apocalyptic number.

It is an amenable number.

997478901 is a deficient number, since it is larger than the sum of its proper divisors (480819019).

997478901 is a wasteful number, since it uses less digits than its factorization.

997478901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13793 (or 13787 counting only the distinct ones).

The product of its (nonzero) digits is 1143072, while the sum is 54.

The square root of 997478901 is about 31582.8893706703. The cubic root of 997478901 is about 999.1589264603.

The spelling of 997478901 in words is "nine hundred ninety-seven million, four hundred seventy-eight thousand, nine hundred one".