261612143 has 8 divisors (see below), whose sum is σ = 293985888. Its totient is φ = 230988384.

The previous prime is 261612107. The next prime is 261612191. The reversal of 261612143 is 341216162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 261612143 - 2¹² = 261608047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261612343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 437180 + ... + 437777.

It is an arithmetic number, because the mean of its divisors is an integer number (36748236).

Almost surely, 2^261612143 is an apocalyptic number.

261612143 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

261612143 is a deficient number, since it is larger than the sum of its proper divisors (32373745).

261612143 is a wasteful number, since it uses less digits than its factorization.

261612143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 874993.

The product of its digits is 1728, while the sum is 26.

The square root of 261612143 is about 16174.4286761542. The cubic root of 261612143 is about 639.5668806184.

The spelling of 261612143 in words is "two hundred sixty-one million, six hundred twelve thousand, one hundred forty-three".