261226943 has 4 divisors (see below), whose sum is σ = 261337440. Its totient is φ = 261116448.

The previous prime is 261226921. The next prime is 261226957. The reversal of 261226943 is 349622162.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261226943 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 (261223943) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51623 + ... + 56456.

It is an arithmetic number, because the mean of its divisors is an integer number (65334360).

Almost surely, 2^261226943 is an apocalyptic number.

261226943 is a deficient number, since it is larger than the sum of its proper divisors (110497).

261226943 is a wasteful number, since it uses less digits than its factorization.

261226943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110496.

The product of its digits is 31104, while the sum is 35.

The square root of 261226943 is about 16162.5166047865. The cubic root of 261226943 is about 639.2528251450.

The spelling of 261226943 in words is "two hundred sixty-one million, two hundred twenty-six thousand, nine hundred forty-three".