51867091 has 4 divisors (see below), whose sum is σ = 53132184. Its totient is φ = 50602000.

The previous prime is 51867083. The next prime is 51867097. The reversal of 51867091 is 19076815.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19076815 = 5 ⋅3815363.

It is a cyclic number.

It is not a de Polignac number, because 51867091 - 2³ = 51867083 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 51867091.

It is not an unprimeable number, because it can be changed into a prime (51867097) 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, 632485 + ... + 632566.

It is an arithmetic number, because the mean of its divisors is an integer number (13283046).

Almost surely, 2^51867091 is an apocalyptic number.

51867091 is a deficient number, since it is larger than the sum of its proper divisors (1265093).

51867091 is a wasteful number, since it uses less digits than its factorization.

51867091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1265092.

The product of its (nonzero) digits is 15120, while the sum is 37.

The square root of 51867091 is about 7201.8810737196. The cubic root of 51867091 is about 372.9328415915.

The spelling of 51867091 in words is "fifty-one million, eight hundred sixty-seven thousand, ninety-one".