51654399 has 4 divisors (see below), whose sum is σ = 68872536. Its totient is φ = 34436264.

The previous prime is 51654391. The next prime is 51654431. The reversal of 51654399 is 99345615.

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

It is a cyclic number.

It is not a de Polignac number, because 51654399 - 2³ = 51654391 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51654399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51654391) 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, 8609064 + ... + 8609069.

It is an arithmetic number, because the mean of its divisors is an integer number (17218134).

Almost surely, 2^51654399 is an apocalyptic number.

51654399 is a deficient number, since it is larger than the sum of its proper divisors (17218137).

51654399 is a wasteful number, since it uses less digits than its factorization.

51654399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17218136.

The product of its digits is 145800, while the sum is 42.

The square root of 51654399 is about 7187.0994844930. The cubic root of 51654399 is about 372.4223798151.

The spelling of 51654399 in words is "fifty-one million, six hundred fifty-four thousand, three hundred ninety-nine".