51817949 has 8 divisors (see below), whose sum is σ = 52721760. Its totient is φ = 50922000.

The previous prime is 51817939. The next prime is 51817951. The reversal of 51817949 is 94971815.

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 51817949 - 2⁴ = 51817933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51817939) 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, 12194 + ... + 15884.

It is an arithmetic number, because the mean of its divisors is an integer number (6590220).

Almost surely, 2^51817949 is an apocalyptic number.

It is an amenable number.

51817949 is a deficient number, since it is larger than the sum of its proper divisors (903811).

51817949 is a wasteful number, since it uses less digits than its factorization.

51817949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3931.

The product of its digits is 90720, while the sum is 44.

The square root of 51817949 is about 7198.4685176779. The cubic root of 51817949 is about 372.8150247104.

The spelling of 51817949 in words is "fifty-one million, eight hundred seventeen thousand, nine hundred forty-nine".