261513002 has 8 divisors (see below), whose sum is σ = 393041700. Its totient is φ = 130499104.

The previous prime is 261513001. The next prime is 261513019. The reversal of 261513002 is 200315162.

It can be written as a sum of positive squares in 2 ways, for example, as 222337921 + 39175081 = 14911^2 + 6259^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (261513001) 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 3 ways as a sum of consecutive naturals, for example, 127427 + ... + 129462.

Almost surely, 2^261513002 is an apocalyptic number.

261513002 is a deficient number, since it is larger than the sum of its proper divisors (131528698).

261513002 is a wasteful number, since it uses less digits than its factorization.

261513002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257400.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 261513002 is about 16171.3636407076. The cubic root of 261513002 is about 639.4860799456.

Adding to 261513002 its reverse (200315162), we get a palindrome (461828164).

The spelling of 261513002 in words is "two hundred sixty-one million, five hundred thirteen thousand, two".