616721097 has 16 divisors (see below), whose sum is σ = 828944640. Its totient is φ = 407836800.

The previous prime is 616721089. The next prime is 616721107. The reversal of 616721097 is 790127616.

It is not a de Polignac number, because 616721097 - 2³ = 616721089 is a prime.

It is a super-2 number, since 2×616721097² = 760689822969766818, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (616721797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 199947 + ... + 203007.

It is an arithmetic number, because the mean of its divisors is an integer number (51809040).

Almost surely, 2^616721097 is an apocalyptic number.

It is an amenable number.

616721097 is a deficient number, since it is larger than the sum of its proper divisors (212223543).

616721097 is a wasteful number, since it uses less digits than its factorization.

616721097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3584.

The product of its (nonzero) digits is 31752, while the sum is 39.

The square root of 616721097 is about 24833.8699561707. The cubic root of 616721097 is about 851.1960541628.

The spelling of 616721097 in words is "six hundred sixteen million, seven hundred twenty-one thousand, ninety-seven".