431990157 has 4 divisors (see below), whose sum is σ = 575986880. Its totient is φ = 287993436.

The previous prime is 431990131. The next prime is 431990159. The reversal of 431990157 is 751099134.

It is a happy number.

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 not a de Polignac number, because 431990157 - 2⁶ = 431990093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (431990159) 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, 71998357 + ... + 71998362.

It is an arithmetic number, because the mean of its divisors is an integer number (143996720).

Almost surely, 2^431990157 is an apocalyptic number.

It is an amenable number.

431990157 is a deficient number, since it is larger than the sum of its proper divisors (143996723).

431990157 is a wasteful number, since it uses less digits than its factorization.

431990157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143996722.

The product of its (nonzero) digits is 34020, while the sum is 39.

The square root of 431990157 is about 20784.3729036986. The cubic root of 431990157 is about 755.9468885031.

The spelling of 431990157 in words is "four hundred thirty-one million, nine hundred ninety thousand, one hundred fifty-seven".