3540943781 has 4 divisors (see below), whose sum is σ = 3547714752. Its totient is φ = 3534172812.

The previous prime is 3540943741. The next prime is 3540943801. The reversal of 3540943781 is 1873490453.

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 3540943781 - 2²² = 3536749477 is a prime.

It is a super-2 number, since 2×3540943781² = 25076565720405151922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3540943711) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3384701 + ... + 3385746.

It is an arithmetic number, because the mean of its divisors is an integer number (886928688).

Almost surely, 2^3540943781 is an apocalyptic number.

It is an amenable number.

3540943781 is a deficient number, since it is larger than the sum of its proper divisors (6770971).

3540943781 is an equidigital number, since it uses as much as digits as its factorization.

3540943781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6770970.

The product of its (nonzero) digits is 362880, while the sum is 44.

The square root of 3540943781 is about 59505.8298068349. The cubic root of 3540943781 is about 1524.1919978011.

The spelling of 3540943781 in words is "three billion, five hundred forty million, nine hundred forty-three thousand, seven hundred eighty-one".