261232501 has 8 divisors (see below), whose sum is σ = 278856000. Its totient is φ = 243996480.

The previous prime is 261232483. The next prime is 261232513. The reversal of 261232501 is 105232162.

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

It is not a de Polignac number, because 261232501 - 2¹⁹ = 260708213 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 (261232541) 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, 95476 + ... + 98173.

It is an arithmetic number, because the mean of its divisors is an integer number (34857000).

Almost surely, 2^261232501 is an apocalyptic number.

It is an amenable number.

261232501 is a deficient number, since it is larger than the sum of its proper divisors (17623499).

261232501 is a wasteful number, since it uses less digits than its factorization.

261232501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193739.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 261232501 is about 16162.6885449173. The cubic root of 261232501 is about 639.2573588045.

Adding to 261232501 its reverse (105232162), we get a palindrome (366464663).

The spelling of 261232501 in words is "two hundred sixty-one million, two hundred thirty-two thousand, five hundred one".