431221307 has 4 divisors (see below), whose sum is σ = 470423256. Its totient is φ = 392019360.

The previous prime is 431221291. The next prime is 431221309. The reversal of 431221307 is 703122134.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 431221307 - 2⁴ = 431221291 is a prime.

It is a super-2 number, since 2×431221307² = 371903631221576498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (431221309) 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, 19600958 + ... + 19600979.

It is an arithmetic number, because the mean of its divisors is an integer number (117605814).

Almost surely, 2^431221307 is an apocalyptic number.

431221307 is a deficient number, since it is larger than the sum of its proper divisors (39201949).

431221307 is a wasteful number, since it uses less digits than its factorization.

431221307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39201948.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 431221307 is about 20765.8687995470. The cubic root of 431221307 is about 755.4981476334.

The spelling of 431221307 in words is "four hundred thirty-one million, two hundred twenty-one thousand, three hundred seven".