261571423 has 8 divisors (see below), whose sum is σ = 275595120. Its totient is φ = 247573440.

The previous prime is 261571381. The next prime is 261571439. The reversal of 261571423 is 324175162.

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 261571423 - 2¹⁷ = 261440351 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 (261571823) 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, 16611 + ... + 28267.

It is an arithmetic number, because the mean of its divisors is an integer number (34449390).

Almost surely, 2^261571423 is an apocalyptic number.

261571423 is a deficient number, since it is larger than the sum of its proper divisors (14023697).

261571423 is a wasteful number, since it uses less digits than its factorization.

261571423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12857.

The product of its digits is 10080, while the sum is 31.

The square root of 261571423 is about 16173.1698500943. The cubic root of 261571423 is about 639.5336959779.

The spelling of 261571423 in words is "two hundred sixty-one million, five hundred seventy-one thousand, four hundred twenty-three".