721112061 has 16 divisors (see below), whose sum is σ = 969753600. Its totient is φ = 476622768.

The previous prime is 721112047. The next prime is 721112081. The reversal of 721112061 is 160211127.

It is a happy number.

It is not a de Polignac number, because 721112061 - 2¹⁸ = 720849917 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721112081) 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, 195250 + ... + 198908.

It is an arithmetic number, because the mean of its divisors is an integer number (60609600).

Almost surely, 2^721112061 is an apocalyptic number.

It is an amenable number.

721112061 is a deficient number, since it is larger than the sum of its proper divisors (248641539).

721112061 is a wasteful number, since it uses less digits than its factorization.

721112061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4208.

The product of its (nonzero) digits is 168, while the sum is 21.

The square root of 721112061 is about 26853.5297679839. The cubic root of 721112061 is about 896.7421559664.

Adding to 721112061 its reverse (160211127), we get a palindrome (881323188).

The spelling of 721112061 in words is "seven hundred twenty-one million, one hundred twelve thousand, sixty-one".