56181749 has 16 divisors (see below), whose sum is σ = 62545392. Its totient is φ = 50139648.

The previous prime is 56181743. The next prime is 56181751. The reversal of 56181749 is 94718165.

It can be written as a sum of positive squares in 8 ways, for example, as 6027025 + 50154724 = 2455^2 + 7082^2 .

It is not a de Polignac number, because 56181749 - 2¹⁶ = 56116213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56181743) 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, 49739 + ... + 50855.

It is an arithmetic number, because the mean of its divisors is an integer number (3909087).

Almost surely, 2^56181749 is an apocalyptic number.

It is an amenable number.

56181749 is a deficient number, since it is larger than the sum of its proper divisors (6363643).

56181749 is a wasteful number, since it uses less digits than its factorization.

56181749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1256.

The product of its digits is 60480, while the sum is 41.

The square root of 56181749 is about 7495.4485522882. The cubic root of 56181749 is about 382.9996864111. Note that the first 3 decimals are identical.

The spelling of 56181749 in words is "fifty-six million, one hundred eighty-one thousand, seven hundred forty-nine".