51145423 has 4 divisors (see below), whose sum is σ = 58451920. Its totient is φ = 43838928.

The previous prime is 51145417. The next prime is 51145427. The reversal of 51145423 is 32454115.

It is a happy number.

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

It is not a de Polignac number, because 51145423 - 2²¹ = 49048271 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51145427) 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, 3653238 + ... + 3653251.

It is an arithmetic number, because the mean of its divisors is an integer number (14612980).

Almost surely, 2^51145423 is an apocalyptic number.

51145423 is a deficient number, since it is larger than the sum of its proper divisors (7306497).

51145423 is an equidigital number, since it uses as much as digits as its factorization.

51145423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7306496.

The product of its digits is 2400, while the sum is 25.

The square root of 51145423 is about 7151.6028273388. The cubic root of 51145423 is about 371.1951202005.

Adding to 51145423 its reverse (32454115), we get a palindrome (83599538).

The spelling of 51145423 in words is "fifty-one million, one hundred forty-five thousand, four hundred twenty-three".