1640221241 has 8 divisors (see below), whose sum is σ = 1722039360. Its totient is φ = 1559278512.

The previous prime is 1640221229. The next prime is 1640221243. The reversal of 1640221241 is 1421220461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1640221241 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1640221243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 215006 + ... + 222503.

It is an arithmetic number, because the mean of its divisors is an integer number (215254920).

Almost surely, 2^1640221241 is an apocalyptic number.

It is an amenable number.

1640221241 is a deficient number, since it is larger than the sum of its proper divisors (81818119).

1640221241 is a wasteful number, since it uses less digits than its factorization.

1640221241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437695.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 1640221241 is about 40499.6449490610. The cubic root of 1640221241 is about 1179.3267348158.

The spelling of 1640221241 in words is "one billion, six hundred forty million, two hundred twenty-one thousand, two hundred forty-one".