261423147 has 16 divisors (see below), whose sum is σ = 371941760. Its totient is φ = 162844992.

The previous prime is 261423143. The next prime is 261423157. The reversal of 261423147 is 741324162.

It is not a de Polignac number, because 261423147 - 2² = 261423143 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261423143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27253 + ... + 35574.

It is an arithmetic number, because the mean of its divisors is an integer number (23246360).

Almost surely, 2^261423147 is an apocalyptic number.

261423147 is a deficient number, since it is larger than the sum of its proper divisors (110518613).

261423147 is a wasteful number, since it uses less digits than its factorization.

261423147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62922.

The product of its digits is 8064, while the sum is 30.

The square root of 261423147 is about 16168.5851885686. The cubic root of 261423147 is about 639.4128297902.

The spelling of 261423147 in words is "two hundred sixty-one million, four hundred twenty-three thousand, one hundred forty-seven".