1981058 has 4 divisors (see below), whose sum is σ = 2971590. Its totient is φ = 990528.

The previous prime is 1981037. The next prime is 1981081. The reversal of 1981058 is 8501891.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8501891 = 109 ⋅77999.

It can be written as a sum of positive squares in only one way, i.e., 1605289 + 375769 = 1267^2 + 613^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495263 + ... + 495266.

2^1981058 is an apocalyptic number.

1981058 is a deficient number, since it is larger than the sum of its proper divisors (990532).

1981058 is an equidigital number, since it uses as much as digits as its factorization.

1981058 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 990531.

The product of its (nonzero) digits is 2880, while the sum is 32.

The square root of 1981058 is about 1407.5006216695. The cubic root of 1981058 is about 125.5930855458.

The spelling of 1981058 in words is "one million, nine hundred eighty-one thousand, fifty-eight".