261211432 has 8 divisors (see below), whose sum is σ = 489771450. Its totient is φ = 130605712.

The previous prime is 261211361. The next prime is 261211463. The reversal of 261211432 is 234112162.

It can be written as a sum of positive squares in only one way, i.e., 174609796 + 86601636 = 13214^2 + 9306^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

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, 16325707 + ... + 16325722.

Almost surely, 2^261211432 is an apocalyptic number.

It is an amenable number.

261211432 is a deficient number, since it is larger than the sum of its proper divisors (228560018).

261211432 is a wasteful number, since it uses less digits than its factorization.

261211432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32651435 (or 32651431 counting only the distinct ones).

The product of its digits is 576, while the sum is 22.

The square root of 261211432 is about 16162.0367528353. The cubic root of 261211432 is about 639.2401724854.

Adding to 261211432 its reverse (234112162), we get a palindrome (495323594).

The spelling of 261211432 in words is "two hundred sixty-one million, two hundred eleven thousand, four hundred thirty-two".