172649251 has 2 divisors, whose sum is σ = 172649252. Its totient is φ = 172649250.

The previous prime is 172649179. The next prime is 172649287. The reversal of 172649251 is 152946271.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 172649251 - 2⁹ = 172648739 is a prime.

It is a super-2 number, since 2×172649251² = 59615527741722002, which contains 22 as substring.

It is equal to p_9642961 and since 172649251 and 9642961 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 172649251.

It is not a weakly prime, because it can be changed into another prime (172649051) 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, 86324625 + 86324626.

It is an arithmetic number, because the mean of its divisors is an integer number (86324626).

Almost surely, 2^172649251 is an apocalyptic number.

172649251 is a deficient number, since it is larger than the sum of its proper divisors (1).

172649251 is an equidigital number, since it uses as much as digits as its factorization.

172649251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 37.

The square root of 172649251 is about 13139.6061965342. The cubic root of 172649251 is about 556.8286418742.

The spelling of 172649251 in words is "one hundred seventy-two million, six hundred forty-nine thousand, two hundred fifty-one".