1640735201 has 4 divisors (see below), whose sum is σ = 1875125952. Its totient is φ = 1406344452.

The previous prime is 1640735191. The next prime is 1640735207. The reversal of 1640735201 is 1025370461.

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: 1025370461 = 263 ⋅3898747.

It is a cyclic number.

It is not a de Polignac number, because 1640735201 - 2⁶ = 1640735137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1640735207) 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, 117195365 + ... + 117195378.

It is an arithmetic number, because the mean of its divisors is an integer number (468781488).

Almost surely, 2^1640735201 is an apocalyptic number.

It is an amenable number.

1640735201 is a deficient number, since it is larger than the sum of its proper divisors (234390751).

1640735201 is an equidigital number, since it uses as much as digits as its factorization.

1640735201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234390750.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 1640735201 is about 40505.9896928837. The cubic root of 1640735201 is about 1179.4499018324.

The spelling of 1640735201 in words is "one billion, six hundred forty million, seven hundred thirty-five thousand, two hundred one".