706221561 has 4 divisors (see below), whose sum is σ = 941628752. Its totient is φ = 470814372.

The previous prime is 706221559. The next prime is 706221611. The reversal of 706221561 is 165122607.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 706221561 - 2¹ = 706221559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (706221511) 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, 117703591 + ... + 117703596.

It is an arithmetic number, because the mean of its divisors is an integer number (235407188).

Almost surely, 2^706221561 is an apocalyptic number.

It is an amenable number.

706221561 is a deficient number, since it is larger than the sum of its proper divisors (235407191).

706221561 is a wasteful number, since it uses less digits than its factorization.

706221561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235407190.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 706221561 is about 26574.8294632346. The cubic root of 706221561 is about 890.5267937120.

The spelling of 706221561 in words is "seven hundred six million, two hundred twenty-one thousand, five hundred sixty-one".