15601001 has 4 divisors (see below), whose sum is σ = 16801092. Its totient is φ = 14400912.

The previous prime is 15600989. The next prime is 15601007. The reversal of 15601001 is 10010651.

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 2088025 + 13512976 = 1445^2 + 3676^2 .

It is a cyclic number.

It is not a de Polignac number, because 15601001 - 2¹⁸ = 15338857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15601007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 600026 + ... + 600051.

It is an arithmetic number, because the mean of its divisors is an integer number (4200273).

Almost surely, 2^15601001 is an apocalyptic number.

It is an amenable number.

15601001 is a deficient number, since it is larger than the sum of its proper divisors (1200091).

15601001 is a wasteful number, since it uses less digits than its factorization.

15601001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1200090.

The product of its (nonzero) digits is 30, while the sum is 14.

The square root of 15601001 is about 3949.8102486069. The cubic root of 15601001 is about 249.8719397468.

Adding to 15601001 its reverse (10010651), we get a palindrome (25611652).

The spelling of 15601001 in words is "fifteen million, six hundred one thousand, one".