261630530 has 16 divisors (see below), whose sum is σ = 538211520. Its totient is φ = 89701872.

The previous prime is 261630521. The next prime is 261630557. The reversal of 261630530 is 35036162.

It is a self number, because there is not a number n which added to its sum of digits gives 261630530.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1868720 + ... + 1868859.

It is an arithmetic number, because the mean of its divisors is an integer number (33638220).

Almost surely, 2^261630530 is an apocalyptic number.

261630530 is an abundant number, since it is smaller than the sum of its proper divisors (276580990).

261630530 is a wasteful number, since it uses less digits than its factorization.

261630530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3737593.

The product of its (nonzero) digits is 3240, while the sum is 26.

The square root of 261630530 is about 16174.9970633691. The cubic root of 261630530 is about 639.5818639197.

Adding to 261630530 its reverse (35036162), we get a palindrome (296666692).

The spelling of 261630530 in words is "two hundred sixty-one million, six hundred thirty thousand, five hundred thirty".