1620741611 has 4 divisors (see below), whose sum is σ = 1621175400. Its totient is φ = 1620307824.

The previous prime is 1620741607. The next prime is 1620741613. The reversal of 1620741611 is 1161470261.

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

It is a cyclic number.

It is not a de Polignac number, because 1620741611 - 2² = 1620741607 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1620741613) 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, 211241 + ... + 218778.

It is an arithmetic number, because the mean of its divisors is an integer number (405293850).

Almost surely, 2^1620741611 is an apocalyptic number.

1620741611 is a deficient number, since it is larger than the sum of its proper divisors (433789).

1620741611 is an equidigital number, since it uses as much as digits as its factorization.

1620741611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433788.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 1620741611 is about 40258.4352775912. The cubic root of 1620741611 is about 1174.6394816092.

The spelling of 1620741611 in words is "one billion, six hundred twenty million, seven hundred forty-one thousand, six hundred eleven".