261000742 has 4 divisors (see below), whose sum is σ = 391501116. Its totient is φ = 130500370.

The previous prime is 261000737. The next prime is 261000781. The reversal of 261000742 is 247000162.

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

It is a super-3 number, since 3×261000742³ (a number of 26 digits) contains 333 as substring.

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 polite number, since it can be written as a sum of consecutive naturals, namely, 65250184 + ... + 65250187.

It is an arithmetic number, because the mean of its divisors is an integer number (97875279).

Almost surely, 2^261000742 is an apocalyptic number.

261000742 is a deficient number, since it is larger than the sum of its proper divisors (130500374).

261000742 is a wasteful number, since it uses less digits than its factorization.

261000742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130500373.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 261000742 is about 16155.5173857107. The cubic root of 261000742 is about 639.0682584437.

The spelling of 261000742 in words is "two hundred sixty-one million, seven hundred forty-two", and thus it is an aban number.