921523 has 2 divisors, whose sum is σ = 921524. Its totient is φ = 921522.

The previous prime is 921517. The next prime is 921563. The reversal of 921523 is 325129.

It is a weak prime.

921523 is a truncatable prime.

It is a cyclic number.

It is not a de Polignac number, because 921523 - 2⁵ = 921491 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 921494 and 921503.

It is not a weakly prime, because it can be changed into another prime (921563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460761 + 460762.

It is an arithmetic number, because the mean of its divisors is an integer number (460762).

2⁹²¹⁵²³ is an apocalyptic number.

921523 is a deficient number, since it is larger than the sum of its proper divisors (1).

921523 is an equidigital number, since it uses as much as digits as its factorization.

921523 is an evil number, because the sum of its binary digits is even.

The product of its digits is 540, while the sum is 22.

The square root of 921523 is about 959.9598949956. The cubic root of 921523 is about 97.3125216132.

It can be divided in two parts, 921 and 523, that added together give a square (1444 = 38²).

The spelling of 921523 in words is "nine hundred twenty-one thousand, five hundred twenty-three".