261357229 has 12 divisors (see below), whose sum is σ = 306254844. Its totient is φ = 222379584.

The previous prime is 261357209. The next prime is 261357241. The reversal of 261357229 is 922753162.

It can be written as a sum of positive squares in 2 ways, for example, as 50381604 + 210975625 = 7098^2 + 14525^2 .

It is not a de Polignac number, because 261357229 - 2⁷ = 261357101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261357209) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12754 + ... + 26179.

It is an arithmetic number, because the mean of its divisors is an integer number (25521237).

Almost surely, 2^261357229 is an apocalyptic number.

It is an amenable number.

261357229 is a deficient number, since it is larger than the sum of its proper divisors (44897615).

261357229 is a wasteful number, since it uses less digits than its factorization.

261357229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39084 (or 39077 counting only the distinct ones).

The product of its digits is 45360, while the sum is 37.

The square root of 261357229 is about 16166.5466009287. The cubic root of 261357229 is about 639.3590824990.

The spelling of 261357229 in words is "two hundred sixty-one million, three hundred fifty-seven thousand, two hundred twenty-nine".