56069991 has 12 divisors (see below), whose sum is σ = 81226600. Its totient is φ = 37270800.

The previous prime is 56069989. The next prime is 56070017. The reversal of 56069991 is 19996065.

It is not a de Polignac number, because 56069991 - 2¹ = 56069989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56069921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5785 + ... + 12066.

Almost surely, 2^56069991 is an apocalyptic number.

56069991 is a deficient number, since it is larger than the sum of its proper divisors (25156609).

56069991 is a wasteful number, since it uses less digits than its factorization.

56069991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18206 (or 18203 counting only the distinct ones).

The product of its (nonzero) digits is 131220, while the sum is 45.

The square root of 56069991 is about 7487.9897836469. The cubic root of 56069991 is about 382.7455606326.

The spelling of 56069991 in words is "fifty-six million, sixty-nine thousand, nine hundred ninety-one".