261411493 has 4 divisors (see below), whose sum is σ = 298756000. Its totient is φ = 224066988.

The previous prime is 261411473. The next prime is 261411503. The reversal of 261411493 is 394114162.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261411493 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 (261411473) 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, 18672243 + ... + 18672256.

It is an arithmetic number, because the mean of its divisors is an integer number (74689000).

Almost surely, 2^261411493 is an apocalyptic number.

It is an amenable number.

261411493 is a deficient number, since it is larger than the sum of its proper divisors (37344507).

261411493 is an equidigital number, since it uses as much as digits as its factorization.

261411493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37344506.

The product of its digits is 5184, while the sum is 31.

The square root of 261411493 is about 16168.2247943304. The cubic root of 261411493 is about 639.4033281732.

The spelling of 261411493 in words is "two hundred sixty-one million, four hundred eleven thousand, four hundred ninety-three".