51489499 has 4 divisors (see below), whose sum is σ = 51534936. Its totient is φ = 51444064.

The previous prime is 51489491. The next prime is 51489509. The reversal of 51489499 is 99498415.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 51489499 - 2³ = 51489491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51489491) 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, 20974 + ... + 23299.

It is an arithmetic number, because the mean of its divisors is an integer number (12883734).

Almost surely, 2^51489499 is an apocalyptic number.

51489499 is a deficient number, since it is larger than the sum of its proper divisors (45437).

51489499 is a wasteful number, since it uses less digits than its factorization.

51489499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45436.

The product of its digits is 466560, while the sum is 49.

The square root of 51489499 is about 7175.6183705657. The cubic root of 51489499 is about 372.0256538943.

The spelling of 51489499 in words is "fifty-one million, four hundred eighty-nine thousand, four hundred ninety-nine".