261271442 has 4 divisors (see below), whose sum is σ = 391907166. Its totient is φ = 130635720.

The previous prime is 261271399. The next prime is 261271459. The reversal of 261271442 is 244172162.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 259499881 + 1771561 = 16109^2 + 1331^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65317859 + ... + 65317862.

Almost surely, 2^261271442 is an apocalyptic number.

261271442 is a deficient number, since it is larger than the sum of its proper divisors (130635724).

261271442 is a wasteful number, since it uses less digits than its factorization.

261271442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130635723.

The product of its digits is 5376, while the sum is 29.

The square root of 261271442 is about 16163.8931572811. The cubic root of 261271442 is about 639.2891211668.

The spelling of 261271442 in words is "two hundred sixty-one million, two hundred seventy-one thousand, four hundred forty-two".