172113437 has 2 divisors, whose sum is σ = 172113438. Its totient is φ = 172113436.

The previous prime is 172113413. The next prime is 172113509. The reversal of 172113437 is 734311271.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 147719716 + 24393721 = 12154^2 + 4939^2 .

It is a cyclic number.

It is not a de Polignac number, because 172113437 - 2¹² = 172109341 is a prime.

It is a super-3 number, since 3×172113437³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172113037) 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, 86056718 + 86056719.

It is an arithmetic number, because the mean of its divisors is an integer number (86056719).

Almost surely, 2^172113437 is an apocalyptic number.

It is an amenable number.

172113437 is a deficient number, since it is larger than the sum of its proper divisors (1).

172113437 is an equidigital number, since it uses as much as digits as its factorization.

172113437 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3528, while the sum is 29.

The square root of 172113437 is about 13119.2010808585. The cubic root of 172113437 is about 556.2520088805.

The spelling of 172113437 in words is "one hundred seventy-two million, one hundred thirteen thousand, four hundred thirty-seven".