15642061 has 2 divisors, whose sum is σ = 15642062. Its totient is φ = 15642060.

The previous prime is 15642059. The next prime is 15642089. The reversal of 15642061 is 16024651.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15642025 + 36 = 3955^2 + 6^2 .

It is an emirp because it is prime and its reverse (16024651) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15642061 - 2¹ = 15642059 is a prime.

Together with 15642059, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15642031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7821030 + 7821031.

It is an arithmetic number, because the mean of its divisors is an integer number (7821031).

Almost surely, 2^15642061 is an apocalyptic number.

It is an amenable number.

15642061 is a deficient number, since it is larger than the sum of its proper divisors (1).

15642061 is an equidigital number, since it uses as much as digits as its factorization.

15642061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 15642061 is about 3955.0045511984. The cubic root of 15642061 is about 250.0909589019.

The spelling of 15642061 in words is "fifteen million, six hundred forty-two thousand, sixty-one".