172661047 has 6 divisors (see below), whose sum is σ = 186964512. Its totient is φ = 159379272.

The previous prime is 172661029. The next prime is 172661053. The reversal of 172661047 is 740166271.

It is a happy number.

172661047 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 172661047 - 2¹⁹ = 172136759 is a prime.

It is a super-2 number, since 2×172661047² = 59623674302272418, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172661017) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 510663 + ... + 511000.

It is an arithmetic number, because the mean of its divisors is an integer number (31160752).

Almost surely, 2^172661047 is an apocalyptic number.

172661047 is a deficient number, since it is larger than the sum of its proper divisors (14303465).

172661047 is a wasteful number, since it uses less digits than its factorization.

172661047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1021689 (or 1021676 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 172661047 is about 13140.0550607674. The cubic root of 172661047 is about 556.8413230781.

The spelling of 172661047 in words is "one hundred seventy-two million, six hundred sixty-one thousand, forty-seven".