1601498561 has 4 divisors (see below), whose sum is σ = 1724690772. Its totient is φ = 1478306352.

The previous prime is 1601498557. The next prime is 1601498573. The reversal of 1601498561 is 1658941061.

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 892874161 + 708624400 = 29881^2 + 26620^2 .

It is a cyclic number.

It is not a de Polignac number, because 1601498561 - 2² = 1601498557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1601498551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61596086 + ... + 61596111.

It is an arithmetic number, because the mean of its divisors is an integer number (431172693).

Almost surely, 2^1601498561 is an apocalyptic number.

It is an amenable number.

1601498561 is a deficient number, since it is larger than the sum of its proper divisors (123192211).

1601498561 is a wasteful number, since it uses less digits than its factorization.

1601498561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123192210.

The product of its (nonzero) digits is 51840, while the sum is 41.

The square root of 1601498561 is about 40018.7276284492. The cubic root of 1601498561 is about 1169.9721329228.

The spelling of 1601498561 in words is "one billion, six hundred one million, four hundred ninety-eight thousand, five hundred sixty-one".