261957413 has 2 divisors, whose sum is σ = 261957414. Its totient is φ = 261957412.

The previous prime is 261957407. The next prime is 261957433. The reversal of 261957413 is 314759162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 237375649 + 24581764 = 15407^2 + 4958^2 .

It is a cyclic number.

It is not a de Polignac number, because 261957413 - 2¹⁰ = 261956389 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261957433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130978706 + 130978707.

It is an arithmetic number, because the mean of its divisors is an integer number (130978707).

Almost surely, 2^261957413 is an apocalyptic number.

It is an amenable number.

261957413 is a deficient number, since it is larger than the sum of its proper divisors (1).

261957413 is an equidigital number, since it uses as much as digits as its factorization.

261957413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 38.

The square root of 261957413 is about 16185.0984859531. The cubic root of 261957413 is about 639.8481190701.

The spelling of 261957413 in words is "two hundred sixty-one million, nine hundred fifty-seven thousand, four hundred thirteen".