431440997 has 4 divisors (see below), whose sum is σ = 464628780. Its totient is φ = 398253216.

The previous prime is 431440987. The next prime is 431441009. The reversal of 431440997 is 799044134.

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

It can be written as a sum of positive squares in 2 ways, for example, as 173870596 + 257570401 = 13186^2 + 16049^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-431440997 is a prime.

It is a super-2 number, since 2×431440997² = 372282667784708018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (431440927) 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, 16593872 + ... + 16593897.

It is an arithmetic number, because the mean of its divisors is an integer number (116157195).

Almost surely, 2^431440997 is an apocalyptic number.

It is an amenable number.

431440997 is a deficient number, since it is larger than the sum of its proper divisors (33187783).

431440997 is a wasteful number, since it uses less digits than its factorization.

431440997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33187782.

The product of its (nonzero) digits is 108864, while the sum is 41.

The square root of 431440997 is about 20771.1578155865. The cubic root of 431440997 is about 755.6264245432.

The spelling of 431440997 in words is "four hundred thirty-one million, four hundred forty thousand, nine hundred ninety-seven".