51858091 has 4 divisors (see below), whose sum is σ = 51949800. Its totient is φ = 51766384.

The previous prime is 51858047. The next prime is 51858161. The reversal of 51858091 is 19085815.

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 51858091 - 2¹¹ = 51856043 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 51858091.

It is not an unprimeable number, because it can be changed into a prime (51855091) 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, 45001 + ... + 46138.

It is an arithmetic number, because the mean of its divisors is an integer number (12987450).

Almost surely, 2^51858091 is an apocalyptic number.

51858091 is a deficient number, since it is larger than the sum of its proper divisors (91709).

51858091 is an equidigital number, since it uses as much as digits as its factorization.

51858091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91708.

The product of its (nonzero) digits is 14400, while the sum is 37.

The square root of 51858091 is about 7201.2562098567. The cubic root of 51858091 is about 372.9112698545.

It can be divided in two parts, 5185809 and 1, that added together give a triangular number (5185810 = T₃₂₂₀).

The spelling of 51858091 in words is "fifty-one million, eight hundred fifty-eight thousand, ninety-one".