172146649 has 2 divisors, whose sum is σ = 172146650. Its totient is φ = 172146648.

The previous prime is 172146617. The next prime is 172146683. The reversal of 172146649 is 946641271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 133171600 + 38975049 = 11540^2 + 6243^2 .

It is an emirp because it is prime and its reverse (946641271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 172146649 - 2⁵ = 172146617 is a prime.

It is not a weakly prime, because it can be changed into another prime (172146449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86073324 + 86073325.

It is an arithmetic number, because the mean of its divisors is an integer number (86073325).

Almost surely, 2^172146649 is an apocalyptic number.

It is an amenable number.

172146649 is a deficient number, since it is larger than the sum of its proper divisors (1).

172146649 is an equidigital number, since it uses as much as digits as its factorization.

172146649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 40.

The square root of 172146649 is about 13120.4667980983. The cubic root of 172146649 is about 556.2877857764.

The spelling of 172146649 in words is "one hundred seventy-two million, one hundred forty-six thousand, six hundred forty-nine".