15420641 has 2 divisors, whose sum is σ = 15420642. Its totient is φ = 15420640.

The previous prime is 15420637. The next prime is 15420659. The reversal of 15420641 is 14602451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9150625 + 6270016 = 3025^2 + 2504^2 .

It is an emirp because it is prime and its reverse (14602451) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15420641 - 2² = 15420637 is a prime.

It is not a weakly prime, because it can be changed into another prime (15420611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7710320 + 7710321.

It is an arithmetic number, because the mean of its divisors is an integer number (7710321).

Almost surely, 2^15420641 is an apocalyptic number.

It is an amenable number.

15420641 is a deficient number, since it is larger than the sum of its proper divisors (1).

15420641 is an equidigital number, since it uses as much as digits as its factorization.

15420641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 15420641 is about 3926.9124003471. The cubic root of 15420641 is about 248.9052988475.

It can be divided in two parts, 15420 and 641, that added together give a palindrome (16061).

The spelling of 15420641 in words is "fifteen million, four hundred twenty thousand, six hundred forty-one".