56091421 has 4 divisors (see below), whose sum is σ = 56195644. Its totient is φ = 55987200.

The previous prime is 56091419. The next prime is 56091467. The reversal of 56091421 is 12419065.

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

It can be written as a sum of positive squares in 2 ways, for example, as 18404100 + 37687321 = 4290^2 + 6139^2 .

It is a 5-Lehmer number, since φ(56091421) divides (56091421-1)⁵.

It is a cyclic number.

It is not a de Polignac number, because 56091421 - 2¹ = 56091419 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 56091421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56097421) 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, 51300 + ... + 52381.

It is an arithmetic number, because the mean of its divisors is an integer number (14048911).

Almost surely, 2^56091421 is an apocalyptic number.

It is an amenable number.

56091421 is a deficient number, since it is larger than the sum of its proper divisors (104223).

56091421 is a wasteful number, since it uses less digits than its factorization.

56091421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104222.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 56091421 is about 7489.4206050936. The cubic root of 56091421 is about 382.7943163186.

The spelling of 56091421 in words is "fifty-six million, ninety-one thousand, four hundred twenty-one".