921431 has 8 divisors (see below), whose sum is σ = 1061760. Its totient is φ = 783288.

The previous prime is 921409. The next prime is 921457. The reversal of 921431 is 134129.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 921431 - 2¹⁰ = 920407 is a prime.

It is a super-2 number, since 2×921431² = 1698070175522, which contains 22 as substring.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 921431.

It is not an unprimeable number, because it can be changed into a prime (921491) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 500 + ... + 1446.

It is an arithmetic number, because the mean of its divisors is an integer number (132720).

2⁹²¹⁴³¹ is an apocalyptic number.

921431 is a deficient number, since it is larger than the sum of its proper divisors (140329).

921431 is a wasteful number, since it uses less digits than its factorization.

921431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1093.

The product of its digits is 216, while the sum is 20.

The square root of 921431 is about 959.9119751311. The cubic root of 921431 is about 97.3092831157.

The spelling of 921431 in words is "nine hundred twenty-one thousand, four hundred thirty-one".