53651621 has 2 divisors, whose sum is σ = 53651622. Its totient is φ = 53651620.

The previous prime is 53651597. The next prime is 53651629. The reversal of 53651621 is 12615635.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30129121 + 23522500 = 5489^2 + 4850^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-53651621 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 (53651629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26825810 + 26825811.

It is an arithmetic number, because the mean of its divisors is an integer number (26825811).

Almost surely, 2^53651621 is an apocalyptic number.

It is an amenable number.

53651621 is a deficient number, since it is larger than the sum of its proper divisors (1).

53651621 is an equidigital number, since it uses as much as digits as its factorization.

53651621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5400, while the sum is 29.

The square root of 53651621 is about 7324.7266843207. The cubic root of 53651621 is about 377.1617272892.

The spelling of 53651621 in words is "fifty-three million, six hundred fifty-one thousand, six hundred twenty-one".