56172901 has 4 divisors (see below), whose sum is σ = 56227500. Its totient is φ = 56118304.

The previous prime is 56172889. The next prime is 56172917. The reversal of 56172901 is 10927165.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10927165 = 5 ⋅2185433.

It can be written as a sum of positive squares in 2 ways, for example, as 21669025 + 34503876 = 4655^2 + 5874^2 .

It is a cyclic number.

It is not a de Polignac number, because 56172901 - 2⁵ = 56172869 is a prime.

It is a super-4 number, since 4×56172901⁴ (a number of 32 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56172001) 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, 25726 + ... + 27823.

It is an arithmetic number, because the mean of its divisors is an integer number (14056875).

Almost surely, 2^56172901 is an apocalyptic number.

It is an amenable number.

56172901 is a deficient number, since it is larger than the sum of its proper divisors (54599).

56172901 is a wasteful number, since it uses less digits than its factorization.

56172901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54598.

The product of its (nonzero) digits is 3780, while the sum is 31.

The square root of 56172901 is about 7494.8583041976. The cubic root of 56172901 is about 382.9795792933.

The spelling of 56172901 in words is "fifty-six million, one hundred seventy-two thousand, nine hundred one".