4091381845 has 16 divisors (see below), whose sum is σ = 5109001920. Its totient is φ = 3142790784.

The previous prime is 4091381843. The next prime is 4091381873. The reversal of 4091381845 is 5481831904.

It is a cyclic number.

It is not a de Polignac number, because 4091381845 - 2¹ = 4091381843 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4091381843) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 148584 + ... + 173953.

It is an arithmetic number, because the mean of its divisors is an integer number (319312620).

Almost surely, 2^4091381845 is an apocalyptic number.

It is an amenable number.

4091381845 is a deficient number, since it is larger than the sum of its proper divisors (1017620075).

4091381845 is a wasteful number, since it uses less digits than its factorization.

4091381845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322644.

The product of its (nonzero) digits is 138240, while the sum is 43.

The square root of 4091381845 is about 63963.9104886498. The cubic root of 4091381845 is about 1599.3984515999.

The spelling of 4091381845 in words is "four billion, ninety-one million, three hundred eighty-one thousand, eight hundred forty-five".