261015402 has 32 divisors (see below), whose sum is σ = 526901760. Its totient is φ = 86198000.

The previous prime is 261015379. The next prime is 261015413. The reversal of 261015402 is 204510162.

It is an unprimeable number.

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, 395749 + ... + 396407.

It is an arithmetic number, because the mean of its divisors is an integer number (16465680).

Almost surely, 2^261015402 is an apocalyptic number.

261015402 is an abundant number, since it is smaller than the sum of its proper divisors (265886358).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261015402 is a wasteful number, since it uses less digits than its factorization.

261015402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1178.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 261015402 is about 16155.9710943044. The cubic root of 261015402 is about 639.0802233717.

Adding to 261015402 its reverse (204510162), we get a palindrome (465525564).

The spelling of 261015402 in words is "two hundred sixty-one million, fifteen thousand, four hundred two".