53161921 has 2 divisors, whose sum is σ = 53161922. Its totient is φ = 53161920.

The previous prime is 53161903. The next prime is 53161937. The reversal of 53161921 is 12916135.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53129521 + 32400 = 7289^2 + 180^2 .

It is a cyclic number.

It is not a de Polignac number, because 53161921 - 2⁷ = 53161793 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 53161921.

It is not a weakly prime, because it can be changed into another prime (53161421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26580960 + 26580961.

It is an arithmetic number, because the mean of its divisors is an integer number (26580961).

Almost surely, 2^53161921 is an apocalyptic number.

It is an amenable number.

53161921 is a deficient number, since it is larger than the sum of its proper divisors (1).

53161921 is an equidigital number, since it uses as much as digits as its factorization.

53161921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1620, while the sum is 28.

The square root of 53161921 is about 7291.2221883577. Note that the first 3 decimals coincide. The cubic root of 53161921 is about 376.0107157992.

The spelling of 53161921 in words is "fifty-three million, one hundred sixty-one thousand, nine hundred twenty-one".