164426731 has 4 divisors (see below), whose sum is σ = 187916272. Its totient is φ = 140937192.

The previous prime is 164426693. The next prime is 164426749. The reversal of 164426731 is 137624461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 137624461 = 13 ⋅10586497.

It is a cyclic number.

It is not a de Polignac number, because 164426731 - 2⁹ = 164426219 is a prime.

It is a super-3 number, since 3×164426731³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164426231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11744760 + ... + 11744773.

It is an arithmetic number, because the mean of its divisors is an integer number (46979068).

Almost surely, 2^164426731 is an apocalyptic number.

164426731 is a deficient number, since it is larger than the sum of its proper divisors (23489541).

164426731 is an equidigital number, since it uses as much as digits as its factorization.

164426731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23489540.

The product of its digits is 24192, while the sum is 34.

The square root of 164426731 is about 12822.8986972525. The cubic root of 164426731 is about 547.8447122026.

The spelling of 164426731 in words is "one hundred sixty-four million, four hundred twenty-six thousand, seven hundred thirty-one".