261463415 has 4 divisors (see below), whose sum is σ = 313756104. Its totient is φ = 209170728.

The previous prime is 261463387. The next prime is 261463421. The reversal of 261463415 is 514364162.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 261463415 - 2¹⁴ = 261447031 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26146337 + ... + 26146346.

It is an arithmetic number, because the mean of its divisors is an integer number (78439026).

Almost surely, 2^261463415 is an apocalyptic number.

261463415 is a deficient number, since it is larger than the sum of its proper divisors (52292689).

261463415 is an equidigital number, since it uses as much as digits as its factorization.

261463415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52292688.

The product of its digits is 17280, while the sum is 32.

The square root of 261463415 is about 16169.8303949052. The cubic root of 261463415 is about 639.4456585001.

The spelling of 261463415 in words is "two hundred sixty-one million, four hundred sixty-three thousand, four hundred fifteen".