261945629 has 8 divisors (see below), whose sum is σ = 294977280. Its totient is φ = 230450400.

The previous prime is 261945623. The next prime is 261945641. The reversal of 261945629 is 926549162.

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 261945629 - 2²⁰ = 260897053 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261945629.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261945623) 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, 383744 + ... + 384425.

It is an arithmetic number, because the mean of its divisors is an integer number (36872160).

Almost surely, 2^261945629 is an apocalyptic number.

It is an amenable number.

261945629 is a deficient number, since it is larger than the sum of its proper divisors (33031651).

261945629 is a wasteful number, since it uses less digits than its factorization.

261945629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 768211.

The product of its digits is 233280, while the sum is 44.

The square root of 261945629 is about 16184.7344432956. The cubic root of 261945629 is about 639.8385245292.

The spelling of 261945629 in words is "two hundred sixty-one million, nine hundred forty-five thousand, six hundred twenty-nine".