261201149 has 4 divisors (see below), whose sum is σ = 284946720. Its totient is φ = 237455580.

The previous prime is 261201131. The next prime is 261201163. The reversal of 261201149 is 941102162.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 261201149 - 2²⁰ = 260152573 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 (261201349) 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, 11872769 + ... + 11872790.

It is an arithmetic number, because the mean of its divisors is an integer number (71236680).

Almost surely, 2^261201149 is an apocalyptic number.

It is an amenable number.

261201149 is a deficient number, since it is larger than the sum of its proper divisors (23745571).

261201149 is a wasteful number, since it uses less digits than its factorization.

261201149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23745570.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 261201149 is about 16161.7186276708. The cubic root of 261201149 is about 639.2317841427.

The spelling of 261201149 in words is "two hundred sixty-one million, two hundred one thousand, one hundred forty-nine".