401381 has 2 divisors, whose sum is σ = 401382. Its totient is φ = 401380.

The previous prime is 401371. The next prime is 401393. The reversal of 401381 is 183104.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 330625 + 70756 = 575^2 + 266^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-401381 is a prime.

It is a super-2 number, since 2×401381² = 322213414322, which contains 22 as substring.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200690 + 200691.

It is an arithmetic number, because the mean of its divisors is an integer number (200691).

2⁴⁰¹³⁸¹ is an apocalyptic number.

It is an amenable number.

401381 is a deficient number, since it is larger than the sum of its proper divisors (1).

401381 is an equidigital number, since it uses as much as digits as its factorization.

401381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 401381 is about 633.5463676796. The cubic root of 401381 is about 73.7653267006.

Adding to 401381 its reverse (183104), we get a palindrome (584485).

The spelling of 401381 in words is "four hundred one thousand, three hundred eighty-one".