50001381 has 18 divisors (see below), whose sum is σ = 75008102. Its totient is φ = 33329880.

The previous prime is 50001377. The next prime is 50001383. The reversal of 50001381 is 18310005.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 48525156 + 1476225 = 6966^2 + 1215^2 .

It is not a de Polignac number, because 50001381 - 2² = 50001377 is a prime.

It is a super-2 number, since 2×50001381² = 5000276203814322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (50001383) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2751 + ... + 10371.

Almost surely, 2^50001381 is an apocalyptic number.

It is an amenable number.

50001381 is a deficient number, since it is larger than the sum of its proper divisors (25006721).

50001381 is an frugal number, since it uses more digits than its factorization.

50001381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7645 (or 7624 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 50001381 is about 7071.1654626377. The cubic root of 50001381 is about 368.4065415978.

Adding to 50001381 its reverse (18310005), we get a palindrome (68311386).

The spelling of 50001381 in words is "fifty million, one thousand, three hundred eighty-one".