51145554 has 16 divisors (see below), whose sum is σ = 108308448. Its totient is φ = 16045632.

The previous prime is 51145553. The next prime is 51145561. The reversal of 51145554 is 45554115.

It is not an unprimeable number, because it can be changed into a prime (51145553) 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, 250612 + ... + 250815.

It is an arithmetic number, because the mean of its divisors is an integer number (6769278).

Almost surely, 2^51145554 is an apocalyptic number.

51145554 is an abundant number, since it is smaller than the sum of its proper divisors (57162894).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51145554 is a wasteful number, since it uses less digits than its factorization.

51145554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501449.

The product of its digits is 10000, while the sum is 30.

The square root of 51145554 is about 7151.6119861189. The cubic root of 51145554 is about 371.1954371172.

Adding to 51145554 its reverse (45554115), we get a palindrome (96699669).

The spelling of 51145554 in words is "fifty-one million, one hundred forty-five thousand, five hundred fifty-four".