51557801 has 4 divisors (see below), whose sum is σ = 51951504. Its totient is φ = 51164100.

The previous prime is 51557791. The next prime is 51557819. The reversal of 51557801 is 10875515.

It is a happy number.

51557801 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51557801 - 2²² = 47363497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51557501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 196655 + ... + 196916.

It is an arithmetic number, because the mean of its divisors is an integer number (12987876).

Almost surely, 2^51557801 is an apocalyptic number.

It is an amenable number.

51557801 is a deficient number, since it is larger than the sum of its proper divisors (393703).

51557801 is a wasteful number, since it uses less digits than its factorization.

51557801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393702.

The product of its (nonzero) digits is 7000, while the sum is 32.

The square root of 51557801 is about 7180.3761043555. The cubic root of 51557801 is about 372.1900813943.

The spelling of 51557801 in words is "fifty-one million, five hundred fifty-seven thousand, eight hundred one".