261396524 has 6 divisors (see below), whose sum is σ = 457443924. Its totient is φ = 130698260.

The previous prime is 261396523. The next prime is 261396617. The reversal of 261396524 is 425693162.

It is not an unprimeable number, because it can be changed into a prime (261396521) 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, 32674562 + ... + 32674569.

It is an arithmetic number, because the mean of its divisors is an integer number (76240654).

Almost surely, 2^261396524 is an apocalyptic number.

It is an amenable number.

261396524 is a deficient number, since it is larger than the sum of its proper divisors (196047400).

261396524 is a wasteful number, since it uses less digits than its factorization.

261396524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65349135 (or 65349133 counting only the distinct ones).

The product of its digits is 77760, while the sum is 38.

The square root of 261396524 is about 16167.7618735557. The cubic root of 261396524 is about 639.3911233909.

The spelling of 261396524 in words is "two hundred sixty-one million, three hundred ninety-six thousand, five hundred twenty-four".