3640019491 has 4 divisors (see below), whose sum is σ = 3798281232. Its totient is φ = 3481757752.

The previous prime is 3640019479. The next prime is 3640019503. The reversal of 3640019491 is 1949100463.

3640019491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (3640019479) and next prime (3640019503).

It is a cyclic number.

It is not a de Polignac number, because 3640019491 - 2⁵ = 3640019459 is a prime.

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 3640019491.

It is not an unprimeable number, because it can be changed into a prime (3640019441) 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, 79130836 + ... + 79130881.

It is an arithmetic number, because the mean of its divisors is an integer number (949570308).

Almost surely, 2^3640019491 is an apocalyptic number.

3640019491 is a deficient number, since it is larger than the sum of its proper divisors (158261741).

3640019491 is a wasteful number, since it uses less digits than its factorization.

3640019491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158261740.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 3640019491 is about 60332.5740458668. The cubic root of 3640019491 is about 1538.2770818420.

The spelling of 3640019491 in words is "three billion, six hundred forty million, nineteen thousand, four hundred ninety-one".