15696981 has 12 divisors (see below), whose sum is σ = 22882860. Its totient is φ = 10368000.

The previous prime is 15696979. The next prime is 15697037. The reversal of 15696981 is 18969651.

15696981 is a `hidden beast` number, since 1 + 569 + 6 + 9 + 81 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 12215025 + 3481956 = 3495^2 + 1866^2 .

It is not a de Polignac number, because 15696981 - 2¹ = 15696979 is a prime.

It is a super-2 number, since 2×15696981² = 492790425028722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15696911) 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 in 11 ways as a sum of consecutive naturals, for example, 7020 + ... + 8981.

It is an arithmetic number, because the mean of its divisors is an integer number (1906905).

Almost surely, 2^15696981 is an apocalyptic number.

It is an amenable number.

15696981 is a deficient number, since it is larger than the sum of its proper divisors (7185879).

15696981 is a wasteful number, since it uses less digits than its factorization.

15696981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16116 (or 16113 counting only the distinct ones).

The product of its digits is 116640, while the sum is 45.

The square root of 15696981 is about 3961.9415694833. The cubic root of 15696981 is about 250.3833106581.

It can be divided in two parts, 15696 and 981, that multiplied together give a square (15397776 = 3924²).

The spelling of 15696981 in words is "fifteen million, six hundred ninety-six thousand, nine hundred eighty-one".