921031 has 2 divisors, whose sum is σ = 921032. Its totient is φ = 921030.

The previous prime is 921029. The next prime is 921073. The reversal of 921031 is 130129.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 921031 - 2¹ = 921029 is a prime.

It is a super-2 number, since 2×921031² = 1696596205922, which contains 22 as substring.

Together with 921029, it forms a pair of twin primes.

921031 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 920996 and 921014.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (921001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460515 + 460516.

It is an arithmetic number, because the mean of its divisors is an integer number (460516).

2⁹²¹⁰³¹ is an apocalyptic number.

921031 is a deficient number, since it is larger than the sum of its proper divisors (1).

921031 is an equidigital number, since it uses as much as digits as its factorization.

921031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 921031 is about 959.7036000766. The cubic root of 921031 is about 97.2952001849.

The spelling of 921031 in words is "nine hundred twenty-one thousand, thirty-one".