207313561 has 12 divisors (see below), whose sum is σ = 259712292. Its totient is φ = 164027808.

The previous prime is 207313517. The next prime is 207313573. The reversal of 207313561 is 165313702.

It can be written as a sum of positive squares in 2 ways, for example, as 84989961 + 122323600 = 9219^2 + 11060^2 .

It is not a de Polignac number, because 207313561 - 2¹⁷ = 207182489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (207323561) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 162090 + ... + 163363.

It is an arithmetic number, because the mean of its divisors is an integer number (21642691).

Almost surely, 2^207313561 is an apocalyptic number.

It is an amenable number.

207313561 is a deficient number, since it is larger than the sum of its proper divisors (52398731).

207313561 is a wasteful number, since it uses less digits than its factorization.

207313561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325480 (or 325473 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 28.

The square root of 207313561 is about 14398.3874444328. The cubic root of 207313561 is about 591.8467091922.

The spelling of 207313561 in words is "two hundred seven million, three hundred thirteen thousand, five hundred sixty-one".