83653621 has 2 divisors, whose sum is σ = 83653622. Its totient is φ = 83653620.

The previous prime is 83653601. The next prime is 83653649. The reversal of 83653621 is 12635638.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62631396 + 21022225 = 7914^2 + 4585^2 .

It is a cyclic number.

It is not a de Polignac number, because 83653621 - 2⁵ = 83653589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (83653601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41826810 + 41826811.

It is an arithmetic number, because the mean of its divisors is an integer number (41826811).

Almost surely, 2^83653621 is an apocalyptic number.

It is an amenable number.

83653621 is a deficient number, since it is larger than the sum of its proper divisors (1).

83653621 is an equidigital number, since it uses as much as digits as its factorization.

83653621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 34.

The square root of 83653621 is about 9146.2353457584. The cubic root of 83653621 is about 437.3491110681.

The spelling of 83653621 in words is "eighty-three million, six hundred fifty-three thousand, six hundred twenty-one".