716121557 has 2 divisors, whose sum is σ = 716121558. Its totient is φ = 716121556.

The previous prime is 716121509. The next prime is 716121559. The reversal of 716121557 is 755121617.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 631315876 + 84805681 = 25126^2 + 9209^2 .

It is a cyclic number.

It is not a de Polignac number, because 716121557 - 2¹⁸ = 715859413 is a prime.

Together with 716121559, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (716121559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 358060778 + 358060779.

It is an arithmetic number, because the mean of its divisors is an integer number (358060779).

Almost surely, 2^716121557 is an apocalyptic number.

It is an amenable number.

716121557 is a deficient number, since it is larger than the sum of its proper divisors (1).

716121557 is an equidigital number, since it uses as much as digits as its factorization.

716121557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14700, while the sum is 35.

The square root of 716121557 is about 26760.4476233115. The cubic root of 716121557 is about 894.6687108604.

The spelling of 716121557 in words is "seven hundred sixteen million, one hundred twenty-one thousand, five hundred fifty-seven".