51398145 has 56 divisors (see below), whose sum is σ = 94435200. Its totient is φ = 26834976.

The previous prime is 51398141. The next prime is 51398147. The reversal of 51398145 is 54189315.

It is not a de Polignac number, because 51398145 - 2² = 51398141 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51398141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 214936 + ... + 215174.

Almost surely, 2^51398145 is an apocalyptic number.

51398145 is the 3585-th decagonal number.

It is an amenable number.

51398145 is a deficient number, since it is larger than the sum of its proper divisors (43037055).

51398145 is an equidigital number, since it uses as much as digits as its factorization.

51398145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321 (or 306 counting only the distinct ones).

The product of its digits is 21600, while the sum is 36.

The square root of 51398145 is about 7169.2499607700. The cubic root of 51398145 is about 371.8055044676.

The spelling of 51398145 in words is "fifty-one million, three hundred ninety-eight thousand, one hundred forty-five".