261002131 has 8 divisors (see below), whose sum is σ = 287616560. Its totient is φ = 235321632.

The previous prime is 261002111. The next prime is 261002149. The reversal of 261002131 is 131200162.

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

It is not a de Polignac number, because 261002131 - 2⁹ = 261001619 is a prime.

It is a super-2 number, since 2×261002131² = 136244224773082322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261002111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 232896 + ... + 234013.

It is an arithmetic number, because the mean of its divisors is an integer number (35952070).

Almost surely, 2^261002131 is an apocalyptic number.

261002131 is a deficient number, since it is larger than the sum of its proper divisors (26614429).

261002131 is a wasteful number, since it uses less digits than its factorization.

261002131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 466965.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 261002131 is about 16155.5603740632. The cubic root of 261002131 is about 639.0693921113.

Adding to 261002131 its reverse (131200162), we get a palindrome (392202293).

The spelling of 261002131 in words is "two hundred sixty-one million, two thousand, one hundred thirty-one".