997147901 has 4 divisors (see below), whose sum is σ = 1008351900. Its totient is φ = 985943904.

The previous prime is 997147871. The next prime is 997147981. The reversal of 997147901 is 109741799.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 109741799 = 1951 ⋅56249.

It can be written as a sum of positive squares in 2 ways, for example, as 683822500 + 313325401 = 26150^2 + 17701^2 .

It is a cyclic number.

It is not a de Polignac number, because 997147901 - 2¹⁴ = 997131517 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 (997147981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5601866 + ... + 5602043.

It is an arithmetic number, because the mean of its divisors is an integer number (252087975).

Almost surely, 2^997147901 is an apocalyptic number.

It is an amenable number.

997147901 is a deficient number, since it is larger than the sum of its proper divisors (11203999).

997147901 is a wasteful number, since it uses less digits than its factorization.

997147901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11203998.

The product of its (nonzero) digits is 142884, while the sum is 47.

The square root of 997147901 is about 31577.6487566760. The cubic root of 997147901 is about 999.0483950686.

The spelling of 997147901 in words is "nine hundred ninety-seven million, one hundred forty-seven thousand, nine hundred one".