261004523 has 4 divisors (see below), whose sum is σ = 281081808. Its totient is φ = 240927240.

The previous prime is 261004517. The next prime is 261004547. The reversal of 261004523 is 325400162.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 261004523 - 2⁴ = 261004507 is a prime.

It is a super-2 number, since 2×261004523² = 136246722052915058, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261034523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10038623 + ... + 10038648.

It is an arithmetic number, because the mean of its divisors is an integer number (70270452).

Almost surely, 2^261004523 is an apocalyptic number.

261004523 is a deficient number, since it is larger than the sum of its proper divisors (20077285).

261004523 is a wasteful number, since it uses less digits than its factorization.

261004523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20077284.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 261004523 is about 16155.6344041328. The cubic root of 261004523 is about 639.0713443933.

Adding to 261004523 its reverse (325400162), we get a palindrome (586404685).

The spelling of 261004523 in words is "two hundred sixty-one million, four thousand, five hundred twenty-three".