172444157 has 2 divisors, whose sum is σ = 172444158. Its totient is φ = 172444156.

The previous prime is 172444091. The next prime is 172444187. The reversal of 172444157 is 751444271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 165611161 + 6832996 = 12869^2 + 2614^2 .

It is a cyclic number.

It is not a de Polignac number, because 172444157 - 2¹⁸ = 172182013 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172444187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86222078 + 86222079.

It is an arithmetic number, because the mean of its divisors is an integer number (86222079).

Almost surely, 2^172444157 is an apocalyptic number.

It is an amenable number.

172444157 is a deficient number, since it is larger than the sum of its proper divisors (1).

172444157 is an equidigital number, since it uses as much as digits as its factorization.

172444157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31360, while the sum is 35.

The square root of 172444157 is about 13131.7994578047. The cubic root of 172444157 is about 556.6080646753.

The spelling of 172444157 in words is "one hundred seventy-two million, four hundred forty-four thousand, one hundred fifty-seven".