97891001 has 4 divisors (see below), whose sum is σ = 105421092. Its totient is φ = 90360912.

The previous prime is 97890977. The next prime is 97891009. The reversal of 97891001 is 10019879.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10019879 = 1657 ⋅6047.

It can be written as a sum of positive squares in 2 ways, for example, as 6497401 + 91393600 = 2549^2 + 9560^2 .

It is a cyclic number.

It is not a de Polignac number, because 97891001 - 2¹⁰ = 97889977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (97891009) 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, 3765026 + ... + 3765051.

It is an arithmetic number, because the mean of its divisors is an integer number (26355273).

Almost surely, 2^97891001 is an apocalyptic number.

It is an amenable number.

97891001 is a deficient number, since it is larger than the sum of its proper divisors (7530091).

97891001 is a wasteful number, since it uses less digits than its factorization.

97891001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7530090.

The product of its (nonzero) digits is 4536, while the sum is 35.

The square root of 97891001 is about 9893.9881241085. The cubic root of 97891001 is about 460.8726362221.

The spelling of 97891001 in words is "ninety-seven million, eight hundred ninety-one thousand, one".