15639161 has 4 divisors (see below), whose sum is σ = 15762432. Its totient is φ = 15515892.

The previous prime is 15639131. The next prime is 15639179. The reversal of 15639161 is 16193651.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 16193651 = 3593 ⋅4507.

It is a cyclic number.

It is not a de Polignac number, because 15639161 - 2¹⁴ = 15622777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15639101) 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, 61445 + ... + 61698.

It is an arithmetic number, because the mean of its divisors is an integer number (3940608).

Almost surely, 2^15639161 is an apocalyptic number.

It is an amenable number.

15639161 is a deficient number, since it is larger than the sum of its proper divisors (123271).

15639161 is a wasteful number, since it uses less digits than its factorization.

15639161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123270.

The product of its digits is 4860, while the sum is 32.

The square root of 15639161 is about 3954.6379101000. The cubic root of 15639161 is about 250.0755025285.

The spelling of 15639161 in words is "fifteen million, six hundred thirty-nine thousand, one hundred sixty-one".