51321489 has 16 divisors (see below), whose sum is σ = 73708800. Its totient is φ = 31658256.

The previous prime is 51321469. The next prime is 51321499. The reversal of 51321489 is 98412315.

It is not a de Polignac number, because 51321489 - 2²⁰ = 50272913 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51321449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8019 + ... + 12920.

It is an arithmetic number, because the mean of its divisors is an integer number (4606800).

Almost surely, 2^51321489 is an apocalyptic number.

It is an amenable number.

51321489 is a deficient number, since it is larger than the sum of its proper divisors (22387311).

51321489 is a wasteful number, since it uses less digits than its factorization.

51321489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21004.

The product of its digits is 8640, while the sum is 33.

The square root of 51321489 is about 7163.9017999970. The cubic root of 51321489 is about 371.6205736463.

The spelling of 51321489 in words is "fifty-one million, three hundred twenty-one thousand, four hundred eighty-nine".