431381 has 2 divisors, whose sum is σ = 431382. Its totient is φ = 431380.

The previous prime is 431377. The next prime is 431399. The reversal of 431381 is 183134.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 302500 + 128881 = 550^2 + 359^2 .

It is a cyclic number.

It is not a de Polignac number, because 431381 - 2² = 431377 is a prime.

It is a super-2 number, since 2×431381² = 372179134322, which contains 22 as substring.

It is an Ulam number.

It is a plaindrome in base 7.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (431311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215690 + 215691.

It is an arithmetic number, because the mean of its divisors is an integer number (215691).

2⁴³¹³⁸¹ is an apocalyptic number.

It is an amenable number.

431381 is a deficient number, since it is larger than the sum of its proper divisors (1).

431381 is an equidigital number, since it uses as much as digits as its factorization.

431381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288, while the sum is 20.

The square root of 431381 is about 656.7960109501. The cubic root of 431381 is about 75.5591396640.

The spelling of 431381 in words is "four hundred thirty-one thousand, three hundred eighty-one".