201331409 has 4 divisors (see below), whose sum is σ = 205615104. Its totient is φ = 197047716.

The previous prime is 201331399. The next prime is 201331433. The reversal of 201331409 is 904133102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201331409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201331499) 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, 2141777 + ... + 2141870.

It is an arithmetic number, because the mean of its divisors is an integer number (51403776).

Almost surely, 2^201331409 is an apocalyptic number.

It is an amenable number.

201331409 is a deficient number, since it is larger than the sum of its proper divisors (4283695).

201331409 is an equidigital number, since it uses as much as digits as its factorization.

201331409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4283694.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 201331409 is about 14189.1299592329. The cubic root of 201331409 is about 586.0983665008.

The spelling of 201331409 in words is "two hundred one million, three hundred thirty-one thousand, four hundred nine".