172212457 has 2 divisors, whose sum is σ = 172212458. Its totient is φ = 172212456.

The previous prime is 172212449. The next prime is 172212461. The reversal of 172212457 is 754212271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 145057936 + 27154521 = 12044^2 + 5211^2 .

It is an emirp because it is prime and its reverse (754212271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 172212457 - 2³ = 172212449 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (172212407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86106228 + 86106229.

It is an arithmetic number, because the mean of its divisors is an integer number (86106229).

Almost surely, 2^172212457 is an apocalyptic number.

It is an amenable number.

172212457 is a deficient number, since it is larger than the sum of its proper divisors (1).

172212457 is an equidigital number, since it uses as much as digits as its factorization.

172212457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7840, while the sum is 31.

The square root of 172212457 is about 13122.9743960735. The cubic root of 172212457 is about 556.3586624058.

The spelling of 172212457 in words is "one hundred seventy-two million, two hundred twelve thousand, four hundred fifty-seven".