1601616541 has 4 divisors (see below), whose sum is σ = 1830418912. Its totient is φ = 1372814172.

The previous prime is 1601616517. The next prime is 1601616587. The reversal of 1601616541 is 1456161061.

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 1601616541 - 2⁷ = 1601616413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1601616041) 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, 114401175 + ... + 114401188.

It is an arithmetic number, because the mean of its divisors is an integer number (457604728).

Almost surely, 2^1601616541 is an apocalyptic number.

It is an amenable number.

1601616541 is a deficient number, since it is larger than the sum of its proper divisors (228802371).

1601616541 is an equidigital number, since it uses as much as digits as its factorization.

1601616541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228802370.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 1601616541 is about 40020.2016611611. The cubic root of 1601616541 is about 1170.0008622489. Note that the first 3 decimals are identical.

The spelling of 1601616541 in words is "one billion, six hundred one million, six hundred sixteen thousand, five hundred forty-one".