261309214 has 4 divisors (see below), whose sum is σ = 391963824. Its totient is φ = 130654606.

The previous prime is 261309211. The next prime is 261309221. The reversal of 261309214 is 412903162.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261309211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65327302 + ... + 65327305.

It is an arithmetic number, because the mean of its divisors is an integer number (97990956).

Almost surely, 2^261309214 is an apocalyptic number.

261309214 is a deficient number, since it is larger than the sum of its proper divisors (130654610).

261309214 is a wasteful number, since it uses less digits than its factorization.

261309214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130654609.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 261309214 is about 16165.0615216893. The cubic root of 261309214 is about 639.3199270149.

It can be divided in two parts, 26130 and 9214, that added together give a square (35344 = 188²).

The spelling of 261309214 in words is "two hundred sixty-one million, three hundred nine thousand, two hundred fourteen".