261137147 has 6 divisors (see below), whose sum is σ = 272985132. Its totient is φ = 249782852.

The previous prime is 261137131. The next prime is 261137167. The reversal of 261137147 is 741731162.

It is not a de Polignac number, because 261137147 - 2⁴ = 261137131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261137167) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 246293 + ... + 247350.

It is an arithmetic number, because the mean of its divisors is an integer number (45497522).

Almost surely, 2^261137147 is an apocalyptic number.

261137147 is a deficient number, since it is larger than the sum of its proper divisors (11847985).

261137147 is an equidigital number, since it uses as much as digits as its factorization.

261137147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493689 (or 493666 counting only the distinct ones).

The product of its digits is 7056, while the sum is 32.

The square root of 261137147 is about 16159.7384570419. The cubic root of 261137147 is about 639.1795696523.

The spelling of 261137147 in words is "two hundred sixty-one million, one hundred thirty-seven thousand, one hundred forty-seven".