168400131 has 16 divisors (see below), whose sum is σ = 227867904. Its totient is φ = 110611424.

The previous prime is 168400087. The next prime is 168400189. The reversal of 168400131 is 131004861.

It is a cyclic number.

It is not a de Polignac number, because 168400131 - 2⁹ = 168399619 is a prime.

It is a super-2 number, since 2×168400131² = 56717208241634322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (168400031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61906 + ... + 64568.

It is an arithmetic number, because the mean of its divisors is an integer number (14241744).

Almost surely, 2^168400131 is an apocalyptic number.

168400131 is a deficient number, since it is larger than the sum of its proper divisors (59467773).

168400131 is a wasteful number, since it uses less digits than its factorization.

168400131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2970.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 168400131 is about 12976.9076054351. The cubic root of 168400131 is about 552.2225558416. Note that the first 3 decimals are identical.

Adding to 168400131 its reverse (131004861), we get a palindrome (299404992).

The spelling of 168400131 in words is "one hundred sixty-eight million, four hundred thousand, one hundred thirty-one".