1640931193 has 4 divisors (see below), whose sum is σ = 1790106768. Its totient is φ = 1491755620.

The previous prime is 1640931179. The next prime is 1640931211. The reversal of 1640931193 is 3911390461.

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 1640931193 - 2⁵ = 1640931161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1640931133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74587771 + ... + 74587792.

It is an arithmetic number, because the mean of its divisors is an integer number (447526692).

Almost surely, 2^1640931193 is an apocalyptic number.

It is an amenable number.

1640931193 is a deficient number, since it is larger than the sum of its proper divisors (149175575).

1640931193 is a wasteful number, since it uses less digits than its factorization.

1640931193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149175574.

The product of its (nonzero) digits is 17496, while the sum is 37.

The square root of 1640931193 is about 40508.4089171619. The cubic root of 1640931193 is about 1179.4968632070.

The spelling of 1640931193 in words is "one billion, six hundred forty million, nine hundred thirty-one thousand, one hundred ninety-three".