261542315 has 16 divisors (see below), whose sum is σ = 344736000. Its totient is φ = 189601632.

The previous prime is 261542311. The next prime is 261542447. The reversal of 261542315 is 513245162.

It is a cyclic number.

It is not a de Polignac number, because 261542315 - 2² = 261542311 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261542311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57665 + ... + 62034.

It is an arithmetic number, because the mean of its divisors is an integer number (21546000).

Almost surely, 2^261542315 is an apocalyptic number.

261542315 is a deficient number, since it is larger than the sum of its proper divisors (83193685).

261542315 is a wasteful number, since it uses less digits than its factorization.

261542315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119746.

The product of its digits is 7200, while the sum is 29.

The square root of 261542315 is about 16172.2699396220. The cubic root of 261542315 is about 639.5099723907.

Adding to 261542315 its reverse (513245162), we get a palindrome (774787477).

The spelling of 261542315 in words is "two hundred sixty-one million, five hundred forty-two thousand, three hundred fifteen".