51019894 has 4 divisors (see below), whose sum is σ = 76529844. Its totient is φ = 25509946.

The previous prime is 51019889. The next prime is 51019931. The reversal of 51019894 is 49891015.

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

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, 12754972 + ... + 12754975.

It is an arithmetic number, because the mean of its divisors is an integer number (19132461).

Almost surely, 2^51019894 is an apocalyptic number.

51019894 is a deficient number, since it is larger than the sum of its proper divisors (25509950).

51019894 is a wasteful number, since it uses less digits than its factorization.

51019894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25509949.

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 51019894 is about 7142.8211513379. The cubic root of 51019894 is about 370.8911899405.

The spelling of 51019894 in words is "fifty-one million, nineteen thousand, eight hundred ninety-four".