51123445 has 4 divisors (see below), whose sum is σ = 61348140. Its totient is φ = 40898752.

The previous prime is 51123427. The next prime is 51123461. The reversal of 51123445 is 54432115.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 28826161 + 22297284 = 5369^2 + 4722^2 .

It is a cyclic number.

It is not a de Polignac number, because 51123445 - 2¹⁷ = 50992373 is a prime.

It is a super-2 number, since 2×51123445² = 5227213257336050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5112340 + ... + 5112349.

It is an arithmetic number, because the mean of its divisors is an integer number (15337035).

Almost surely, 2^51123445 is an apocalyptic number.

It is an amenable number.

51123445 is a deficient number, since it is larger than the sum of its proper divisors (10224695).

51123445 is a wasteful number, since it uses less digits than its factorization.

51123445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10224694.

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

The square root of 51123445 is about 7150.0660836107. The cubic root of 51123445 is about 371.1419431046.

The spelling of 51123445 in words is "fifty-one million, one hundred twenty-three thousand, four hundred forty-five".