56172011 has 4 divisors (see below), whose sum is σ = 64196592. Its totient is φ = 48147432.

The previous prime is 56172007. The next prime is 56172019. The reversal of 56172011 is 11027165.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 56172011 - 2² = 56172007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56172019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4012280 + ... + 4012293.

It is an arithmetic number, because the mean of its divisors is an integer number (16049148).

Almost surely, 2^56172011 is an apocalyptic number.

56172011 is a deficient number, since it is larger than the sum of its proper divisors (8024581).

56172011 is an equidigital number, since it uses as much as digits as its factorization.

56172011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8024580.

The product of its (nonzero) digits is 420, while the sum is 23.

The square root of 56172011 is about 7494.7989299247. The cubic root of 56172011 is about 382.9775566476.

Adding to 56172011 its reverse (11027165), we get a palindrome (67199176).

The spelling of 56172011 in words is "fifty-six million, one hundred seventy-two thousand, eleven".