261421442 has 4 divisors (see below), whose sum is σ = 392132166. Its totient is φ = 130710720.

The previous prime is 261421441. The next prime is 261421451. The reversal of 261421442 is 244124162.

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., 159794881 + 101626561 = 12641^2 + 10081^2 .

It is not an unprimeable number, because it can be changed into a prime (261421441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65355359 + ... + 65355362.

Almost surely, 2^261421442 is an apocalyptic number.

261421442 is a deficient number, since it is larger than the sum of its proper divisors (130710724).

261421442 is a wasteful number, since it uses less digits than its factorization.

261421442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130710723.

The product of its digits is 3072, while the sum is 26.

The square root of 261421442 is about 16168.5324627809. The cubic root of 261421442 is about 639.4114397052.

The spelling of 261421442 in words is "two hundred sixty-one million, four hundred twenty-one thousand, four hundred forty-two".