172213047 has 10 divisors (see below), whose sum is σ = 257256648. Its totient is φ = 114808644.

The previous prime is 172213033. The next prime is 172213061. The reversal of 172213047 is 740312271.

It is a happy number.

172213047 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (172213033) and next prime (172213061).

It is not a de Polignac number, because 172213047 - 2⁴ = 172213031 is a prime.

It is a super-3 number, since 3×172213047³ (a number of 26 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 172213047.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172213087) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1062963 + ... + 1063124.

Almost surely, 2^172213047 is an apocalyptic number.

172213047 is a deficient number, since it is larger than the sum of its proper divisors (85043601).

172213047 is an equidigital number, since it uses as much as digits as its factorization.

172213047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2126099 (or 2126090 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 172213047 is about 13122.9968757140. The cubic root of 172213047 is about 556.3592977668.

The spelling of 172213047 in words is "one hundred seventy-two million, two hundred thirteen thousand, forty-seven".