51111667 has 4 divisors (see below), whose sum is σ = 51127200. Its totient is φ = 51096136.

The previous prime is 51111661. The next prime is 51111677. The reversal of 51111667 is 76611115.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51111667 is a prime.

It is a super-3 number, since 3×51111667³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51111661) 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, 667 + ... + 10132.

It is an arithmetic number, because the mean of its divisors is an integer number (12781800).

Almost surely, 2^51111667 is an apocalyptic number.

51111667 is a deficient number, since it is larger than the sum of its proper divisors (15533).

51111667 is a wasteful number, since it uses less digits than its factorization.

51111667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15532.

The product of its digits is 1260, while the sum is 28.

The square root of 51111667 is about 7149.2424074163. The cubic root of 51111667 is about 371.1134392512.

The spelling of 51111667 in words is "fifty-one million, one hundred eleven thousand, six hundred sixty-seven".