706231721 has 16 divisors (see below), whose sum is σ = 796583424. Its totient is φ = 621238464.

The previous prime is 706231717. The next prime is 706231723. The reversal of 706231721 is 127132607.

It is not a de Polignac number, because 706231721 - 2² = 706231717 is a prime.

It is not an unprimeable number, because it can be changed into a prime (706231723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78560 + ... + 87086.

It is an arithmetic number, because the mean of its divisors is an integer number (49786464).

Almost surely, 2^706231721 is an apocalyptic number.

It is an amenable number.

706231721 is a deficient number, since it is larger than the sum of its proper divisors (90351703).

706231721 is a wasteful number, since it uses less digits than its factorization.

706231721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8840.

The product of its (nonzero) digits is 3528, while the sum is 29.

The square root of 706231721 is about 26575.0206208763. The cubic root of 706231721 is about 890.5310641890.

It can be divided in two parts, 7062 and 31721, that added together give a palindrome (38783).

The spelling of 706231721 in words is "seven hundred six million, two hundred thirty-one thousand, seven hundred twenty-one".