921629 has 2 divisors, whose sum is σ = 921630. Its totient is φ = 921628.

The previous prime is 921611. The next prime is 921637. The reversal of 921629 is 926129.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 912025 + 9604 = 955^2 + 98^2 .

It is an emirp because it is prime and its reverse (926129) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 921629 - 2⁸ = 921373 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (921029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460814 + 460815.

It is an arithmetic number, because the mean of its divisors is an integer number (460815).

2⁹²¹⁶²⁹ is an apocalyptic number.

It is an amenable number.

921629 is a deficient number, since it is larger than the sum of its proper divisors (1).

921629 is an equidigital number, since it uses as much as digits as its factorization.

921629 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1944, while the sum is 29.

The square root of 921629 is about 960.0151040478. The cubic root of 921629 is about 97.3162526584.

Subtracting from 921629 its sum of digits (29), we obtain a square (921600 = 960²).

The spelling of 921629 in words is "nine hundred twenty-one thousand, six hundred twenty-nine".