51689835 has 12 divisors (see below), whose sum is σ = 89595792. Its totient is φ = 27567888.

The previous prime is 51689831. The next prime is 51689857. The reversal of 51689835 is 53898615.

It is not a de Polignac number, because 51689835 - 2² = 51689831 is a prime.

It is a super-3 number, since 3×51689835³ (a number of 24 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 1148663 = 51689835 / (5 + 1 + 6 + 8 + 9 + 8 + 3 + 5).

It is not an unprimeable number, because it can be changed into a prime (51689831) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 574287 + ... + 574376.

It is an arithmetic number, because the mean of its divisors is an integer number (7466316).

Almost surely, 2^51689835 is an apocalyptic number.

51689835 is a deficient number, since it is larger than the sum of its proper divisors (37905957).

51689835 is a wasteful number, since it uses less digits than its factorization.

51689835 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1148674 (or 1148671 counting only the distinct ones).

The product of its digits is 259200, while the sum is 45.

The square root of 51689835 is about 7189.5643122515. The cubic root of 51689835 is about 372.5075235332.

The spelling of 51689835 in words is "fifty-one million, six hundred eighty-nine thousand, eight hundred thirty-five".