261570629 has 2 divisors, whose sum is σ = 261570630. Its totient is φ = 261570628.

The previous prime is 261570601. The next prime is 261570641. The reversal of 261570629 is 926075162.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 225690529 + 35880100 = 15023^2 + 5990^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261570629 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 261570592 and 261570601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261570689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130785314 + 130785315.

It is an arithmetic number, because the mean of its divisors is an integer number (130785315).

Almost surely, 2^261570629 is an apocalyptic number.

It is an amenable number.

261570629 is a deficient number, since it is larger than the sum of its proper divisors (1).

261570629 is an equidigital number, since it uses as much as digits as its factorization.

261570629 is an odious number, because the sum of its binary digits is odd.

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

The square root of 261570629 is about 16173.1453032488. The cubic root of 261570629 is about 639.5330488758.

The spelling of 261570629 in words is "two hundred sixty-one million, five hundred seventy thousand, six hundred twenty-nine".