172115477 has 2 divisors, whose sum is σ = 172115478. Its totient is φ = 172115476.

The previous prime is 172115423. The next prime is 172115491. The reversal of 172115477 is 774511271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 171898321 + 217156 = 13111^2 + 466^2 .

It is an emirp because it is prime and its reverse (774511271) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172115477 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 (172118477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86057738 + 86057739.

It is an arithmetic number, because the mean of its divisors is an integer number (86057739).

Almost surely, 2^172115477 is an apocalyptic number.

It is an amenable number.

172115477 is a deficient number, since it is larger than the sum of its proper divisors (1).

172115477 is an equidigital number, since it uses as much as digits as its factorization.

172115477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13720, while the sum is 35.

The square root of 172115477 is about 13119.2788292650. The cubic root of 172115477 is about 556.2542065583.

The spelling of 172115477 in words is "one hundred seventy-two million, one hundred fifteen thousand, four hundred seventy-seven".