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40172997829 is a prime number
BaseRepresentation
bin100101011010011111…
…110100110011000101
310211200201120201220111
4211122133310303011
51124233241412304
630242154433021
72621344563436
oct453237646305
9124621521814
1040172997829
1116045678958
127951a32771
133a32b74243
141d3156148d
1510a1caa704
hex95a7f4cc5

40172997829 has 2 divisors, whose sum is σ = 40172997830. Its totient is φ = 40172997828.

The previous prime is 40172997827. The next prime is 40172997883. The reversal of 40172997829 is 92879927104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32960402500 + 7212595329 = 181550^2 + 84927^2 .

It is a cyclic number.

It is not a de Polignac number, because 40172997829 - 21 = 40172997827 is a prime.

It is a super-2 number, since 2×401729978292 (a number of 22 digits) contains 22 as substring.

Together with 40172997827, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40172997827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20086498914 + 20086498915.

It is an arithmetic number, because the mean of its divisors is an integer number (20086498915).

Almost surely, 240172997829 is an apocalyptic number.

It is an amenable number.

40172997829 is a deficient number, since it is larger than the sum of its proper divisors (1).

40172997829 is an equidigital number, since it uses as much as digits as its factorization.

40172997829 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4572288, while the sum is 58.

The spelling of 40172997829 in words is "forty billion, one hundred seventy-two million, nine hundred ninety-seven thousand, eight hundred twenty-nine".