261143641 has 8 divisors (see below), whose sum is σ = 285652224. Its totient is φ = 236763120.

The previous prime is 261143639. The next prime is 261143651. The reversal of 261143641 is 146341162.

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

It is not a de Polignac number, because 261143641 - 2¹ = 261143639 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261143651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27721 + ... + 35926.

It is an arithmetic number, because the mean of its divisors is an integer number (35706528).

Almost surely, 2^261143641 is an apocalyptic number.

It is an amenable number.

261143641 is a deficient number, since it is larger than the sum of its proper divisors (24508583).

261143641 is a wasteful number, since it uses less digits than its factorization.

261143641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64031.

The product of its digits is 3456, while the sum is 28.

The square root of 261143641 is about 16159.9393872626. The cubic root of 261143641 is about 639.1848680147.

The spelling of 261143641 in words is "two hundred sixty-one million, one hundred forty-three thousand, six hundred forty-one".