261355142 has 4 divisors (see below), whose sum is σ = 392032716. Its totient is φ = 130677570.

The previous prime is 261355139. The next prime is 261355169. The reversal of 261355142 is 241553162.

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

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, 65338784 + ... + 65338787.

It is an arithmetic number, because the mean of its divisors is an integer number (98008179).

Almost surely, 2^261355142 is an apocalyptic number.

261355142 is a deficient number, since it is larger than the sum of its proper divisors (130677574).

261355142 is a wasteful number, since it uses less digits than its factorization.

261355142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130677573.

The product of its digits is 7200, while the sum is 29.

The square root of 261355142 is about 16166.4820539287. The cubic root of 261355142 is about 639.3573806828.

The spelling of 261355142 in words is "two hundred sixty-one million, three hundred fifty-five thousand, one hundred forty-two".