172990669 has 2 divisors, whose sum is σ = 172990670. Its totient is φ = 172990668.

The previous prime is 172990627. The next prime is 172990709. The reversal of 172990669 is 966099271.

172990669 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 102212100 + 70778569 = 10110^2 + 8413^2 .

It is a cyclic number.

It is not a de Polignac number, because 172990669 - 2⁷ = 172990541 is a prime.

It is a super-2 number, since 2×172990669² = 59851543122135122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172990369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86495334 + 86495335.

It is an arithmetic number, because the mean of its divisors is an integer number (86495335).

Almost surely, 2^172990669 is an apocalyptic number.

It is an amenable number.

172990669 is a deficient number, since it is larger than the sum of its proper divisors (1).

172990669 is an equidigital number, since it uses as much as digits as its factorization.

172990669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 367416, while the sum is 49.

The square root of 172990669 is about 13152.5917217862. The cubic root of 172990669 is about 557.1954474855.

The spelling of 172990669 in words is "one hundred seventy-two million, nine hundred ninety thousand, six hundred sixty-nine".