261436442 has 4 divisors (see below), whose sum is σ = 392154666. Its totient is φ = 130718220.

The previous prime is 261436429. The next prime is 261436453. The reversal of 261436442 is 244634162.

261436442 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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., 256288081 + 5148361 = 16009^2 + 2269^2 .

It is a junction number, because it is equal to n+sod(n) for n = 261436399 and 261436408.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65359109 + ... + 65359112.

Almost surely, 2^261436442 is an apocalyptic number.

261436442 is a deficient number, since it is larger than the sum of its proper divisors (130718224).

261436442 is a wasteful number, since it uses less digits than its factorization.

261436442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130718223.

The product of its digits is 27648, while the sum is 32.

The square root of 261436442 is about 16168.9963201183. The cubic root of 261436442 is about 639.4236689853.

The spelling of 261436442 in words is "two hundred sixty-one million, four hundred thirty-six thousand, four hundred forty-two".