172019557 has 2 divisors, whose sum is σ = 172019558. Its totient is φ = 172019556.

The previous prime is 172019543. The next prime is 172019567. The reversal of 172019557 is 755910271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 171243396 + 776161 = 13086^2 + 881^2 .

It is an emirp because it is prime and its reverse (755910271) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172019557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172019567) 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 as a sum of consecutive naturals, namely, 86009778 + 86009779.

It is an arithmetic number, because the mean of its divisors is an integer number (86009779).

Almost surely, 2^172019557 is an apocalyptic number.

It is an amenable number.

172019557 is a deficient number, since it is larger than the sum of its proper divisors (1).

172019557 is an equidigital number, since it uses as much as digits as its factorization.

172019557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22050, while the sum is 37.

The square root of 172019557 is about 13115.6226310458. The cubic root of 172019557 is about 556.1508538185.

The spelling of 172019557 in words is "one hundred seventy-two million, nineteen thousand, five hundred fifty-seven".