371981 has 2 divisors, whose sum is σ = 371982. Its totient is φ = 371980.

The previous prime is 371971. The next prime is 371999. The reversal of 371981 is 189173.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 354025 + 17956 = 595^2 + 134^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-371981 is a prime.

It is a super-2 number, since 2×371981² = 276739728722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (371941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 185990 + 185991.

It is an arithmetic number, because the mean of its divisors is an integer number (185991).

2³⁷¹⁹⁸¹ is an apocalyptic number.

It is an amenable number.

371981 is a deficient number, since it is larger than the sum of its proper divisors (1).

371981 is an equidigital number, since it uses as much as digits as its factorization.

371981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1512, while the sum is 29.

The square root of 371981 is about 609.9024512166. The cubic root of 371981 is about 71.9184390219.

The spelling of 371981 in words is "three hundred seventy-one thousand, nine hundred eighty-one".