1605351541 has 4 divisors (see below), whose sum is σ = 1627342732. Its totient is φ = 1583360352.

The previous prime is 1605351509. The next prime is 1605351547. The reversal of 1605351541 is 1451535061.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1110289041 + 495062500 = 33321^2 + 22250^2 .

It is a cyclic number.

It is not a de Polignac number, because 1605351541 - 2⁵ = 1605351509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1605351547) 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, 10995486 + ... + 10995631.

It is an arithmetic number, because the mean of its divisors is an integer number (406835683).

Almost surely, 2^1605351541 is an apocalyptic number.

It is an amenable number.

1605351541 is a deficient number, since it is larger than the sum of its proper divisors (21991191).

1605351541 is an equidigital number, since it uses as much as digits as its factorization.

1605351541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21991190.

The product of its (nonzero) digits is 9000, while the sum is 31.

The square root of 1605351541 is about 40066.8384203196. The cubic root of 1605351541 is about 1170.9096442128.

The spelling of 1605351541 in words is "one billion, six hundred five million, three hundred fifty-one thousand, five hundred forty-one".