51019897 has 8 divisors (see below), whose sum is σ = 52000416. Its totient is φ = 50045952.

The previous prime is 51019889. The next prime is 51019931. The reversal of 51019897 is 79891015.

It is a happy number.

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 51019897 - 2³ = 51019889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51019817) 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, 15738 + ... + 18700.

It is an arithmetic number, because the mean of its divisors is an integer number (6500052).

Almost surely, 2^51019897 is an apocalyptic number.

It is an amenable number.

51019897 is a deficient number, since it is larger than the sum of its proper divisors (980519).

51019897 is a wasteful number, since it uses less digits than its factorization.

51019897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3287.

The product of its (nonzero) digits is 22680, while the sum is 40.

The square root of 51019897 is about 7142.8213613389. The cubic root of 51019897 is about 370.8911972100.

The spelling of 51019897 in words is "fifty-one million, nineteen thousand, eight hundred ninety-seven".