51291166 has 4 divisors (see below), whose sum is σ = 76936752. Its totient is φ = 25645582.

The previous prime is 51291103. The next prime is 51291223. The reversal of 51291166 is 66119215.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66119215 = 5 ⋅13223843.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12822790 + ... + 12822793.

It is an arithmetic number, because the mean of its divisors is an integer number (19234188).

Almost surely, 2^51291166 is an apocalyptic number.

51291166 is a deficient number, since it is larger than the sum of its proper divisors (25645586).

51291166 is a wasteful number, since it uses less digits than its factorization.

51291166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25645585.

The product of its digits is 3240, while the sum is 31.

The square root of 51291166 is about 7161.7851126657. The cubic root of 51291166 is about 371.5473692833.

The spelling of 51291166 in words is "fifty-one million, two hundred ninety-one thousand, one hundred sixty-six".