164120731 has 4 divisors (see below), whose sum is σ = 164436264. Its totient is φ = 163805200.

The previous prime is 164120711. The next prime is 164120741. The reversal of 164120731 is 137021461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 137021461 = 8467 ⋅16183.

It is a cyclic number.

It is not a de Polignac number, because 164120731 - 2¹⁹ = 163596443 is a prime.

It is a super-2 number, since 2×164120731² = 53871228687948722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 164120696 and 164120705.

It is not an unprimeable number, because it can be changed into a prime (164120711) 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, 156985 + ... + 158026.

It is an arithmetic number, because the mean of its divisors is an integer number (41109066).

Almost surely, 2^164120731 is an apocalyptic number.

164120731 is a deficient number, since it is larger than the sum of its proper divisors (315533).

164120731 is an equidigital number, since it uses as much as digits as its factorization.

164120731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315532.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 164120731 is about 12810.9613612718. The cubic root of 164120731 is about 547.5046527686.

The spelling of 164120731 in words is "one hundred sixty-four million, one hundred twenty thousand, seven hundred thirty-one".