261420142 has 4 divisors (see below), whose sum is σ = 392130216. Its totient is φ = 130710070.

The previous prime is 261420113. The next prime is 261420161. The reversal of 261420142 is 241024162.

It is a happy number.

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

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65355034 + ... + 65355037.

It is an arithmetic number, because the mean of its divisors is an integer number (98032554).

Almost surely, 2^261420142 is an apocalyptic number.

261420142 is a deficient number, since it is larger than the sum of its proper divisors (130710074).

261420142 is a wasteful number, since it uses less digits than its factorization.

261420142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130710073.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 261420142 is about 16168.4922611850. The cubic root of 261420142 is about 639.4103798122.

The spelling of 261420142 in words is "two hundred sixty-one million, four hundred twenty thousand, one hundred forty-two".