431222157 has 16 divisors (see below), whose sum is σ = 672472000. Its totient is φ = 272350512.

The previous prime is 431222149. The next prime is 431222171. The reversal of 431222157 is 751222134.

431222157 is a `hidden beast` number, since 431 + 2 + 221 + 5 + 7 = 666.

It is not a de Polignac number, because 431222157 - 2³ = 431222149 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 431222157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (431222107) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 419782 + ... + 420807.

It is an arithmetic number, because the mean of its divisors is an integer number (42029500).

Almost surely, 2^431222157 is an apocalyptic number.

It is an amenable number.

431222157 is a deficient number, since it is larger than the sum of its proper divisors (241249843).

431222157 is a wasteful number, since it uses less digits than its factorization.

431222157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 840617 (or 840611 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 431222157 is about 20765.8892658128. The cubic root of 431222157 is about 755.4986440321.

The spelling of 431222157 in words is "four hundred thirty-one million, two hundred twenty-two thousand, one hundred fifty-seven".