51381489 has 8 divisors (see below), whose sum is σ = 69002080. Its totient is φ = 34007616.

The previous prime is 51381479. The next prime is 51381503. The reversal of 51381489 is 98418315.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51381489 - 2¹⁹ = 50857201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51381469) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61192 + ... + 62025.

It is an arithmetic number, because the mean of its divisors is an integer number (8625260).

Almost surely, 2^51381489 is an apocalyptic number.

It is an amenable number.

51381489 is a deficient number, since it is larger than the sum of its proper divisors (17620591).

51381489 is a wasteful number, since it uses less digits than its factorization.

51381489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123359.

The product of its digits is 34560, while the sum is 39.

The square root of 51381489 is about 7168.0882388542. The cubic root of 51381489 is about 371.7653378978.

The spelling of 51381489 in words is "fifty-one million, three hundred eighty-one thousand, four hundred eighty-nine".