51511887 has 36 divisors (see below), whose sum is σ = 91658736. Its totient is φ = 27699840.

The previous prime is 51511879. The next prime is 51511891. The reversal of 51511887 is 78811515.

It is a happy number.

It is not a de Polignac number, because 51511887 - 2³ = 51511879 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51511847) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 4062 + ... + 10932.

It is an arithmetic number, because the mean of its divisors is an integer number (2546076).

Almost surely, 2^51511887 is an apocalyptic number.

51511887 is a deficient number, since it is larger than the sum of its proper divisors (40146849).

51511887 is a wasteful number, since it uses less digits than its factorization.

51511887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6908 (or 6898 counting only the distinct ones).

The product of its digits is 11200, while the sum is 36.

The square root of 51511887 is about 7177.1782059525. The cubic root of 51511887 is about 372.0795658805.

The spelling of 51511887 in words is "fifty-one million, five hundred eleven thousand, eight hundred eighty-seven".