261391214 has 8 divisors (see below), whose sum is σ = 448099248. Its totient is φ = 112024800.

The previous prime is 261391157. The next prime is 261391219. The reversal of 261391214 is 412193162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261391219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9335387 + ... + 9335414.

It is an arithmetic number, because the mean of its divisors is an integer number (56012406).

Almost surely, 2^261391214 is an apocalyptic number.

261391214 is a deficient number, since it is larger than the sum of its proper divisors (186708034).

261391214 is a wasteful number, since it uses less digits than its factorization.

261391214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18670810.

The product of its digits is 2592, while the sum is 29.

The square root of 261391214 is about 16167.5976570423. The cubic root of 261391214 is about 639.3867938385.

The spelling of 261391214 in words is "two hundred sixty-one million, three hundred ninety-one thousand, two hundred fourteen".