51554645 has 4 divisors (see below), whose sum is σ = 61865580. Its totient is φ = 41243712.

The previous prime is 51554641. The next prime is 51554719. The reversal of 51554645 is 54645515.

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 31832164 + 19722481 = 5642^2 + 4441^2 .

It is a cyclic number.

It is not a de Polignac number, because 51554645 - 2² = 51554641 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51554641) 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, 5155460 + ... + 5155469.

It is an arithmetic number, because the mean of its divisors is an integer number (15466395).

Almost surely, 2^51554645 is an apocalyptic number.

It is an amenable number.

51554645 is a deficient number, since it is larger than the sum of its proper divisors (10310935).

51554645 is a wasteful number, since it uses less digits than its factorization.

51554645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10310934.

The product of its digits is 60000, while the sum is 35.

The square root of 51554645 is about 7180.1563353454. The cubic root of 51554645 is about 372.1824869673.

The spelling of 51554645 in words is "fifty-one million, five hundred fifty-four thousand, six hundred forty-five".