1940162581 has 4 divisors (see below), whose sum is σ = 2217328672. Its totient is φ = 1662996492.

The previous prime is 1940162527. The next prime is 1940162591. The reversal of 1940162581 is 1852610491.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1852610491 = 3769 ⋅491539.

It is a cyclic number.

It is not a de Polignac number, because 1940162581 - 2⁷ = 1940162453 is a prime.

It is a super-2 number, since 2×1940162581² = 7528461681425163122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1940162581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1940162591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138583035 + ... + 138583048.

It is an arithmetic number, because the mean of its divisors is an integer number (554332168).

Almost surely, 2^1940162581 is an apocalyptic number.

It is an amenable number.

1940162581 is a deficient number, since it is larger than the sum of its proper divisors (277166091).

1940162581 is an equidigital number, since it uses as much as digits as its factorization.

1940162581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277166090.

The product of its (nonzero) digits is 17280, while the sum is 37.

The square root of 1940162581 is about 44047.2766581545. The cubic root of 1940162581 is about 1247.2285437120.

The spelling of 1940162581 in words is "one billion, nine hundred forty million, one hundred sixty-two thousand, five hundred eighty-one".