53699621 has 2 divisors, whose sum is σ = 53699622. Its totient is φ = 53699620.

The previous prime is 53699599. The next prime is 53699671. The reversal of 53699621 is 12699635.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48455521 + 5244100 = 6961^2 + 2290^2 .

It is a cyclic number.

It is not a de Polignac number, because 53699621 - 2¹⁴ = 53683237 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 (53699671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26849810 + 26849811.

It is an arithmetic number, because the mean of its divisors is an integer number (26849811).

Almost surely, 2^53699621 is an apocalyptic number.

It is an amenable number.

53699621 is a deficient number, since it is larger than the sum of its proper divisors (1).

53699621 is an equidigital number, since it uses as much as digits as its factorization.

53699621 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 53699621 is about 7328.0025245629. The cubic root of 53699621 is about 377.2741710287.

The spelling of 53699621 in words is "fifty-three million, six hundred ninety-nine thousand, six hundred twenty-one".