15861145 has 16 divisors (see below), whose sum is σ = 20062080. Its totient is φ = 12014464.

The previous prime is 15861121. The next prime is 15861163. The reversal of 15861145 is 54116851.

It is not a de Polignac number, because 15861145 - 2⁹ = 15860633 is a prime.

It is a super-2 number, since 2×15861145² = 503151841422050, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11661 + ... + 12949.

It is an arithmetic number, because the mean of its divisors is an integer number (1253880).

Almost surely, 2^15861145 is an apocalyptic number.

It is an amenable number.

15861145 is a deficient number, since it is larger than the sum of its proper divisors (4200935).

15861145 is a wasteful number, since it uses less digits than its factorization.

15861145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1424.

The product of its digits is 4800, while the sum is 31.

The square root of 15861145 is about 3982.6053030648. The cubic root of 15861145 is about 251.2531479849.

Adding to 15861145 its reverse (54116851), we get a palindrome (69977996).

The spelling of 15861145 in words is "fifteen million, eight hundred sixty-one thousand, one hundred forty-five".