1940582981 has 4 divisors (see below), whose sum is σ = 2003182464. Its totient is φ = 1877983500.

The previous prime is 1940582977. The next prime is 1940582989. The reversal of 1940582981 is 1892850491.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1940582981 - 2² = 1940582977 is a prime.

It is a super-2 number, since 2×1940582981² = 7531724612293692722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1940582989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31299695 + ... + 31299756.

It is an arithmetic number, because the mean of its divisors is an integer number (500795616).

Almost surely, 2^1940582981 is an apocalyptic number.

It is an amenable number.

1940582981 is a deficient number, since it is larger than the sum of its proper divisors (62599483).

1940582981 is an equidigital number, since it uses as much as digits as its factorization.

1940582981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62599482.

The product of its (nonzero) digits is 207360, while the sum is 47.

The square root of 1940582981 is about 44052.0485448747. The cubic root of 1940582981 is about 1247.3186215605.

The spelling of 1940582981 in words is "one billion, nine hundred forty million, five hundred eighty-two thousand, nine hundred eighty-one".