1641958499 has 4 divisors (see below), whose sum is σ = 1645551864. Its totient is φ = 1638365136.

The previous prime is 1641958463. The next prime is 1641958537. The reversal of 1641958499 is 9948591461.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1641958499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1641958429) 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, 1795997 + ... + 1796910.

It is an arithmetic number, because the mean of its divisors is an integer number (411387966).

Almost surely, 2^1641958499 is an apocalyptic number.

1641958499 is a deficient number, since it is larger than the sum of its proper divisors (3593365).

1641958499 is an equidigital number, since it uses as much as digits as its factorization.

1641958499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3593364.

The product of its digits is 2799360, while the sum is 56.

The square root of 1641958499 is about 40521.0870905508. The cubic root of 1641958499 is about 1179.7429534422.

The spelling of 1641958499 in words is "one billion, six hundred forty-one million, nine hundred fifty-eight thousand, four hundred ninety-nine".