15391641 has 4 divisors (see below), whose sum is σ = 20522192. Its totient is φ = 10261092.

The previous prime is 15391639. The next prime is 15391643. The reversal of 15391641 is 14619351.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (15391639) and next prime (15391643).

It is not a de Polignac number, because 15391641 - 2¹ = 15391639 is a prime.

It is a super-2 number, since 2×15391641² = 473805225345762, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 15391599 and 15391608.

It is not an unprimeable number, because it can be changed into a prime (15391643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2565271 + ... + 2565276.

It is an arithmetic number, because the mean of its divisors is an integer number (5130548).

Almost surely, 2^15391641 is an apocalyptic number.

It is an amenable number.

15391641 is a deficient number, since it is larger than the sum of its proper divisors (5130551).

15391641 is an equidigital number, since it uses as much as digits as its factorization.

15391641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5130550.

The product of its digits is 3240, while the sum is 30.

The square root of 15391641 is about 3923.2181942890. The cubic root of 15391641 is about 248.7491708094.

The spelling of 15391641 in words is "fifteen million, three hundred ninety-one thousand, six hundred forty-one".