261547379 has 2 divisors, whose sum is σ = 261547380. Its totient is φ = 261547378.

The previous prime is 261547367. The next prime is 261547411. The reversal of 261547379 is 973745162.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261547379 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (261547309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130773689 + 130773690.

It is an arithmetic number, because the mean of its divisors is an integer number (130773690).

Almost surely, 2^261547379 is an apocalyptic number.

261547379 is a deficient number, since it is larger than the sum of its proper divisors (1).

261547379 is an equidigital number, since it uses as much as digits as its factorization.

261547379 is an evil number, because the sum of its binary digits is even.

The product of its digits is 317520, while the sum is 44.

The square root of 261547379 is about 16172.4265031565. The cubic root of 261547379 is about 639.5140997759.

It can be divided in two parts, 26154 and 7379, that added together give a palindrome (33533).

The spelling of 261547379 in words is "two hundred sixty-one million, five hundred forty-seven thousand, three hundred seventy-nine".