261497212 has 12 divisors (see below), whose sum is σ = 477516816. Its totient is φ = 125063840.

The previous prime is 261497207. The next prime is 261497239. The reversal of 261497212 is 212794162.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1421089 + ... + 1421272.

It is an arithmetic number, because the mean of its divisors is an integer number (39793068).

Almost surely, 2^261497212 is an apocalyptic number.

It is an amenable number.

261497212 is a deficient number, since it is larger than the sum of its proper divisors (216019604).

261497212 is a wasteful number, since it uses less digits than its factorization.

261497212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2842388 (or 2842386 counting only the distinct ones).

The product of its digits is 12096, while the sum is 34.

The square root of 261497212 is about 16170.8754246639. The cubic root of 261497212 is about 639.4732090898.

The spelling of 261497212 in words is "two hundred sixty-one million, four hundred ninety-seven thousand, two hundred twelve".