921605453 has 2 divisors, whose sum is σ = 921605454. Its totient is φ = 921605452.

The previous prime is 921605441. The next prime is 921605459. The reversal of 921605453 is 354506129.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 917968804 + 3636649 = 30298^2 + 1907^2 .

It is a cyclic number.

It is not a de Polignac number, because 921605453 - 2¹⁸ = 921343309 is a prime.

It is a super-2 number, since 2×921605453² = 1698713221998670418, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (921605459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460802726 + 460802727.

It is an arithmetic number, because the mean of its divisors is an integer number (460802727).

Almost surely, 2^921605453 is an apocalyptic number.

It is an amenable number.

921605453 is a deficient number, since it is larger than the sum of its proper divisors (1).

921605453 is an equidigital number, since it uses as much as digits as its factorization.

921605453 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 921605453 is about 30357.9553494632. The cubic root of 921605453 is about 973.1542386310.

The spelling of 921605453 in words is "nine hundred twenty-one million, six hundred five thousand, four hundred fifty-three".