261003623 has 8 divisors (see below), whose sum is σ = 264694080. Its totient is φ = 257333760.

The previous prime is 261003619. The next prime is 261003637. The reversal of 261003623 is 326300162.

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

It is a cyclic number.

It is not a de Polignac number, because 261003623 - 2² = 261003619 is a prime.

It is a super-2 number, since 2×261003623² = 136245782438252258, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261003653) 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 7 ways as a sum of consecutive naturals, for example, 21323 + ... + 31251.

It is an arithmetic number, because the mean of its divisors is an integer number (33086760).

Almost surely, 2^261003623 is an apocalyptic number.

261003623 is a deficient number, since it is larger than the sum of its proper divisors (3690457).

261003623 is an equidigital number, since it uses as much as digits as its factorization.

261003623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10297.

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 261003623 is about 16155.6065500494. The cubic root of 261003623 is about 639.0706098404.

Adding to 261003623 its reverse (326300162), we get a palindrome (587303785).

The spelling of 261003623 in words is "two hundred sixty-one million, three thousand, six hundred twenty-three".