1640583481 has 4 divisors (see below), whose sum is σ = 1726930000. Its totient is φ = 1554236964.

The previous prime is 1640583479. The next prime is 1640583493. The reversal of 1640583481 is 1843850461.

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 1640583481 - 2¹ = 1640583479 is a prime.

It is a super-2 number, since 2×1640583481² = 5383028316260154722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1640583281) 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, 43173231 + ... + 43173268.

It is an arithmetic number, because the mean of its divisors is an integer number (431732500).

Almost surely, 2^1640583481 is an apocalyptic number.

It is an amenable number.

1640583481 is a deficient number, since it is larger than the sum of its proper divisors (86346519).

1640583481 is an equidigital number, since it uses as much as digits as its factorization.

1640583481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86346518.

The product of its (nonzero) digits is 92160, while the sum is 40.

The square root of 1640583481 is about 40504.1168401435. The cubic root of 1640583481 is about 1179.4135458429.

The spelling of 1640583481 in words is "one billion, six hundred forty million, five hundred eighty-three thousand, four hundred eighty-one".