172071481 has 2 divisors, whose sum is σ = 172071482. Its totient is φ = 172071480.

The previous prime is 172071463. The next prime is 172071511. The reversal of 172071481 is 184170271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 172029456 + 42025 = 13116^2 + 205^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172071481 is a prime.

It is a super-2 number, since 2×172071481² = 59217189147066722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (172071461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86035740 + 86035741.

It is an arithmetic number, because the mean of its divisors is an integer number (86035741).

Almost surely, 2^172071481 is an apocalyptic number.

It is an amenable number.

172071481 is a deficient number, since it is larger than the sum of its proper divisors (1).

172071481 is an equidigital number, since it uses as much as digits as its factorization.

172071481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3136, while the sum is 31.

The square root of 172071481 is about 13117.6019531010. The cubic root of 172071481 is about 556.2068061229.

The spelling of 172071481 in words is "one hundred seventy-two million, seventy-one thousand, four hundred eighty-one".