164171540 has 24 divisors (see below), whose sum is σ = 371280840. Its totient is φ = 60617088.

The previous prime is 164171537. The next prime is 164171543. The reversal of 164171540 is 45171461.

It is an interprime number because it is at equal distance from previous prime (164171537) and next prime (164171543).

It can be written as a sum of positive squares in 4 ways, for example, as 2729104 + 161442436 = 1652^2 + 12706^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164171543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 315455 + ... + 315974.

It is an arithmetic number, because the mean of its divisors is an integer number (15470035).

Almost surely, 2^164171540 is an apocalyptic number.

164171540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

164171540 is an abundant number, since it is smaller than the sum of its proper divisors (207109300).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

164171540 is a wasteful number, since it uses less digits than its factorization.

164171540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 631451 (or 631449 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 164171540 is about 12812.9442362011. The cubic root of 164171540 is about 547.5611463299.

The spelling of 164171540 in words is "one hundred sixty-four million, one hundred seventy-one thousand, five hundred forty".