51698667 has 4 divisors (see below), whose sum is σ = 68931560. Its totient is φ = 34465776.

The previous prime is 51698609. The next prime is 51698701. The reversal of 51698667 is 76689615.

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

It is not a de Polignac number, because 51698667 - 2⁷ = 51698539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51698467) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8616442 + ... + 8616447.

It is an arithmetic number, because the mean of its divisors is an integer number (17232890).

Almost surely, 2^51698667 is an apocalyptic number.

51698667 is a deficient number, since it is larger than the sum of its proper divisors (17232893).

51698667 is a wasteful number, since it uses less digits than its factorization.

51698667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17232892.

The product of its digits is 544320, while the sum is 48.

The square root of 51698667 is about 7190.1785096060. The cubic root of 51698667 is about 372.5287385302.

The spelling of 51698667 in words is "fifty-one million, six hundred ninety-eight thousand, six hundred sixty-seven".