51555554 has 8 divisors (see below), whose sum is σ = 77364828. Its totient is φ = 25767280.

The previous prime is 51555521. The next prime is 51555571. The reversal of 51555554 is 45555515.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 51509329 + 46225 = 7177^2 + 215^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon 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, 4544 + ... + 11124.

Almost surely, 2^51555554 is an apocalyptic number.

51555554 is a deficient number, since it is larger than the sum of its proper divisors (25809274).

51555554 is a wasteful number, since it uses less digits than its factorization.

51555554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10500.

The product of its digits is 62500, while the sum is 35.

The square root of 51555554 is about 7180.2196345237. The cubic root of 51555554 is about 372.1846743673.

The spelling of 51555554 in words is "fifty-one million, five hundred fifty-five thousand, five hundred fifty-four".