51801081 has 8 divisors (see below), whose sum is σ = 70752864. Its totient is φ = 33691680.

The previous prime is 51801059. The next prime is 51801107. The reversal of 51801081 is 18010815.

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

It is not a de Polignac number, because 51801081 - 2⁹ = 51800569 is a prime.

It is a super-2 number, since 2×51801081² = 5366703985537122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51801181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 210451 + ... + 210696.

It is an arithmetic number, because the mean of its divisors is an integer number (8844108).

Almost surely, 2^51801081 is an apocalyptic number.

It is an amenable number.

51801081 is a deficient number, since it is larger than the sum of its proper divisors (18951783).

51801081 is a wasteful number, since it uses less digits than its factorization.

51801081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421191.

The product of its (nonzero) digits is 320, while the sum is 24.

The square root of 51801081 is about 7197.2967842100. The cubic root of 51801081 is about 372.7745668738.

Adding to 51801081 its reverse (18010815), we get a palindrome (69811896).

The spelling of 51801081 in words is "fifty-one million, eight hundred one thousand, eighty-one".