15961449 has 16 divisors (see below), whose sum is σ = 24476672. Its totient is φ = 9062928.

The previous prime is 15961441. The next prime is 15961457. The reversal of 15961449 is 94416951.

It is an interprime number because it is at equal distance from previous prime (15961441) and next prime (15961457).

It is not a de Polignac number, because 15961449 - 2³ = 15961441 is a prime.

It is a super-3 number, since 3×15961449³ (a number of 23 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15961441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1092 + ... + 5754.

It is an arithmetic number, because the mean of its divisors is an integer number (1529792).

Almost surely, 2^15961449 is an apocalyptic number.

It is an amenable number.

15961449 is a deficient number, since it is larger than the sum of its proper divisors (8515223).

15961449 is a wasteful number, since it uses less digits than its factorization.

15961449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4836.

The product of its digits is 38880, while the sum is 39.

The square root of 15961449 is about 3995.1782188033. The cubic root of 15961449 is about 251.7816671520.

The spelling of 15961449 in words is "fifteen million, nine hundred sixty-one thousand, four hundred forty-nine".