51102191 has 8 divisors (see below), whose sum is σ = 61476480. Its totient is φ = 41496408.

The previous prime is 51102157. The next prime is 51102193. The reversal of 51102191 is 19120115.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51102191 - 2⁶ = 51102127 is a prime.

It is a super-2 number, since 2×51102191² = 5222867850000962, which contains 22 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 (51102193) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 191981 + ... + 192246.

It is an arithmetic number, because the mean of its divisors is an integer number (7684560).

Almost surely, 2^51102191 is an apocalyptic number.

51102191 is a deficient number, since it is larger than the sum of its proper divisors (10374289).

51102191 is a wasteful number, since it uses less digits than its factorization.

51102191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384253.

The product of its (nonzero) digits is 90, while the sum is 20.

The square root of 51102191 is about 7148.5796491331. The cubic root of 51102191 is about 371.0905032726.

The spelling of 51102191 in words is "fifty-one million, one hundred two thousand, one hundred ninety-one".