201431309 has 8 divisors (see below), whose sum is σ = 213070272. Its totient is φ = 190032480.

The previous prime is 201431287. The next prime is 201431311. The reversal of 201431309 is 903134102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 201431309 - 2⁸ = 201431053 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201431509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58307 + ... + 61664.

It is an arithmetic number, because the mean of its divisors is an integer number (26633784).

Almost surely, 2^201431309 is an apocalyptic number.

It is an amenable number.

201431309 is a deficient number, since it is larger than the sum of its proper divisors (11638963).

201431309 is a wasteful number, since it uses less digits than its factorization.

201431309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120067.

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

The square root of 201431309 is about 14192.6498230598. The cubic root of 201431309 is about 586.1952905152.

The spelling of 201431309 in words is "two hundred one million, four hundred thirty-one thousand, three hundred nine".