261001142 has 24 divisors (see below), whose sum is σ = 404208504. Its totient is φ = 126391104.

The previous prime is 261001123. The next prime is 261001159. The reversal of 261001142 is 241100162.

It is a super-3 number, since 3×261001142³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 261001142.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 602558 + ... + 602990.

It is an arithmetic number, because the mean of its divisors is an integer number (16842021).

Almost surely, 2^261001142 is an apocalyptic number.

261001142 is a deficient number, since it is larger than the sum of its proper divisors (143207362).

261001142 is a wasteful number, since it uses less digits than its factorization.

261001142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 684 (or 641 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 261001142 is about 16155.5297653776. The cubic root of 261001142 is about 639.0685849143.

The spelling of 261001142 in words is "two hundred sixty-one million, one thousand, one hundred forty-two".