940437581 has 2 divisors, whose sum is σ = 940437582. Its totient is φ = 940437580.

The previous prime is 940437577. The next prime is 940437599. The reversal of 940437581 is 185734049.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 720063556 + 220374025 = 26834^2 + 14845^2 .

It is an emirp because it is prime and its reverse (185734049) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 940437581 - 2² = 940437577 is a prime.

It is a super-2 number, since 2×940437581² = 1768845687514263122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (940437481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 470218790 + 470218791.

It is an arithmetic number, because the mean of its divisors is an integer number (470218791).

Almost surely, 2^940437581 is an apocalyptic number.

It is an amenable number.

940437581 is a deficient number, since it is larger than the sum of its proper divisors (1).

940437581 is an equidigital number, since it uses as much as digits as its factorization.

940437581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 940437581 is about 30666.5547624770. The cubic root of 940437581 is about 979.7380880676.

The spelling of 940437581 in words is "nine hundred forty million, four hundred thirty-seven thousand, five hundred eighty-one".