53969621 has 2 divisors, whose sum is σ = 53969622. Its totient is φ = 53969620.

The previous prime is 53969593. The next prime is 53969647. The reversal of 53969621 is 12696935.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27447121 + 26522500 = 5239^2 + 5150^2 .

It is a cyclic number.

It is not a de Polignac number, because 53969621 - 2²² = 49775317 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53969681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26984810 + 26984811.

It is an arithmetic number, because the mean of its divisors is an integer number (26984811).

Almost surely, 2^53969621 is an apocalyptic number.

It is an amenable number.

53969621 is a deficient number, since it is larger than the sum of its proper divisors (1).

53969621 is an equidigital number, since it uses as much as digits as its factorization.

53969621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 87480, while the sum is 41.

The square root of 53969621 is about 7346.4019084175. The cubic root of 53969621 is about 377.9054217808.

The spelling of 53969621 in words is "fifty-three million, nine hundred sixty-nine thousand, six hundred twenty-one".