3941811557 has 4 divisors (see below), whose sum is σ = 4025679936. Its totient is φ = 3857943180.

The previous prime is 3941811551. The next prime is 3941811569. The reversal of 3941811557 is 7551181493.

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: 7551181493 = 59 ⋅127986127.

It is a cyclic number.

It is not a de Polignac number, because 3941811557 - 2⁶ = 3941811493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3941811551) 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, 41934119 + ... + 41934212.

It is an arithmetic number, because the mean of its divisors is an integer number (1006419984).

Almost surely, 2^3941811557 is an apocalyptic number.

It is an amenable number.

3941811557 is a deficient number, since it is larger than the sum of its proper divisors (83868379).

3941811557 is an equidigital number, since it uses as much as digits as its factorization.

3941811557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83868378.

The product of its digits is 151200, while the sum is 44.

The square root of 3941811557 is about 62783.8478989620. The cubic root of 3941811557 is about 1579.6660562463. Note that the first 3 decimals are identical.

The spelling of 3941811557 in words is "three billion, nine hundred forty-one million, eight hundred eleven thousand, five hundred fifty-seven".