56721141 has 20 divisors (see below), whose sum is σ = 85495212. Its totient is φ = 37473408.

The previous prime is 56721139. The next prime is 56721143. The reversal of 56721141 is 14112765.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (56721139) and next prime (56721143).

It can be written as a sum of positive squares in 2 ways, for example, as 8820900 + 47900241 = 2970^2 + 6921^2 .

It is not a de Polignac number, because 56721141 - 2¹ = 56721139 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56721143) 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 19 ways as a sum of consecutive naturals, for example, 6055 + ... + 12251.

Almost surely, 2^56721141 is an apocalyptic number.

It is an amenable number.

56721141 is a deficient number, since it is larger than the sum of its proper divisors (28774071).

56721141 is a wasteful number, since it uses less digits than its factorization.

56721141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6322 (or 6313 counting only the distinct ones).

The product of its digits is 1680, while the sum is 27.

The square root of 56721141 is about 7531.3439039789. The cubic root of 56721141 is about 384.2214908720.

The spelling of 56721141 in words is "fifty-six million, seven hundred twenty-one thousand, one hundred forty-one".