201597489 has 6 divisors (see below), whose sum is σ = 291196386. Its totient is φ = 134398320.

The previous prime is 201597481. The next prime is 201597491. The reversal of 201597489 is 984795102.

It can be written as a sum of positive squares in only one way, i.e., 163405089 + 38192400 = 12783^2 + 6180^2 .

It is not a de Polignac number, because 201597489 - 2³ = 201597481 is a prime.

It is a super-2 number, since 2×201597489² = 81283095142210242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (201597481) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11199852 + ... + 11199869.

It is an arithmetic number, because the mean of its divisors is an integer number (48532731).

Almost surely, 2^201597489 is an apocalyptic number.

It is an amenable number.

201597489 is a deficient number, since it is larger than the sum of its proper divisors (89598897).

201597489 is a wasteful number, since it uses less digits than its factorization.

201597489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22399727 (or 22399724 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

The square root of 201597489 is about 14198.5030548998. The cubic root of 201597489 is about 586.3564491048.

The spelling of 201597489 in words is "two hundred one million, five hundred ninety-seven thousand, four hundred eighty-nine".