50145681 has 16 divisors (see below), whose sum is σ = 70815744. Its totient is φ = 31496784.

The previous prime is 50145677. The next prime is 50145691. The reversal of 50145681 is 18654105.

It is not a de Polignac number, because 50145681 - 2² = 50145677 is a prime.

It is a super-2 number, since 2×50145681² = 5029178645907522, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (50145691) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 801 + ... + 10046.

It is an arithmetic number, because the mean of its divisors is an integer number (4425984).

Almost surely, 2^50145681 is an apocalyptic number.

It is an amenable number.

50145681 is a deficient number, since it is larger than the sum of its proper divisors (20670063).

50145681 is a wasteful number, since it uses less digits than its factorization.

50145681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10940.

The product of its (nonzero) digits is 4800, while the sum is 30.

The square root of 50145681 is about 7081.3615216285. The cubic root of 50145681 is about 368.7605985271.

Adding to 50145681 its reverse (18654105), we get a palindrome (68799786).

The spelling of 50145681 in words is "fifty million, one hundred forty-five thousand, six hundred eighty-one".