261211612 has 6 divisors (see below), whose sum is σ = 457120328. Its totient is φ = 130605804.

The previous prime is 261211609. The next prime is 261211651. The reversal of 261211612 is 216112162.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32651448 + ... + 32651455.

Almost surely, 2^261211612 is an apocalyptic number.

It is an amenable number.

261211612 is a deficient number, since it is larger than the sum of its proper divisors (195908716).

261211612 is a wasteful number, since it uses less digits than its factorization.

261211612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65302907 (or 65302905 counting only the distinct ones).

The product of its digits is 288, while the sum is 22.

The square root of 261211612 is about 16162.0423214395. The cubic root of 261211612 is about 639.2403193181.

Adding to 261211612 its reverse (216112162), we get a palindrome (477323774).

The spelling of 261211612 in words is "two hundred sixty-one million, two hundred eleven thousand, six hundred twelve".