1601513501 has 12 divisors (see below), whose sum is σ = 1865928060. Its totient is φ = 1370557440.

The previous prime is 1601513497. The next prime is 1601513519. The reversal of 1601513501 is 1053151061.

It can be written as a sum of positive squares in 2 ways, for example, as 1185149476 + 416364025 = 34426^2 + 20405^2 .

It is not a de Polignac number, because 1601513501 - 2² = 1601513497 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 (1601513531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5915 + ... + 56903.

It is an arithmetic number, because the mean of its divisors is an integer number (155494005).

Almost surely, 2^1601513501 is an apocalyptic number.

It is an amenable number.

1601513501 is a deficient number, since it is larger than the sum of its proper divisors (264414559).

1601513501 is an equidigital number, since it uses as much as digits as its factorization.

1601513501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51644 (or 51637 counting only the distinct ones).

The product of its (nonzero) digits is 450, while the sum is 23.

The square root of 1601513501 is about 40018.9142906201. The cubic root of 1601513501 is about 1169.9757710423.

Adding to 1601513501 its reverse (1053151061), we get a palindrome (2654664562).

The spelling of 1601513501 in words is "one billion, six hundred one million, five hundred thirteen thousand, five hundred one".