51357189 has 24 divisors (see below), whose sum is σ = 75042912. Its totient is φ = 31056480.

The previous prime is 51357169. The next prime is 51357197. The reversal of 51357189 is 98175315.

It is not a de Polignac number, because 51357189 - 2⁵ = 51357157 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51357169) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 243294 + ... + 243504.

It is an arithmetic number, because the mean of its divisors is an integer number (3126788).

Almost surely, 2^51357189 is an apocalyptic number.

It is an amenable number.

51357189 is a deficient number, since it is larger than the sum of its proper divisors (23685723).

51357189 is a wasteful number, since it uses less digits than its factorization.

51357189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385 (or 306 counting only the distinct ones).

The product of its digits is 37800, while the sum is 39.

The square root of 51357189 is about 7166.3930257836. The cubic root of 51357189 is about 371.7067219617.

The spelling of 51357189 in words is "fifty-one million, three hundred fifty-seven thousand, one hundred eighty-nine".