149170081 has 4 divisors (see below), whose sum is σ = 149345812. Its totient is φ = 148994352.

The previous prime is 149170069. The next prime is 149170117. The reversal of 149170081 is 180071941.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 71571600 + 77598481 = 8460^2 + 8809^2 .

It is a cyclic number.

It is not a de Polignac number, because 149170081 - 2²⁵ = 115615649 is a prime.

It is a super-2 number, since 2×149170081² = 44503426131093122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (149170381) 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, 86586 + ... + 88291.

It is an arithmetic number, because the mean of its divisors is an integer number (37336453).

Almost surely, 2^149170081 is an apocalyptic number.

It is an amenable number.

149170081 is a deficient number, since it is larger than the sum of its proper divisors (175731).

149170081 is an equidigital number, since it uses as much as digits as its factorization.

149170081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175730.

The product of its (nonzero) digits is 2016, while the sum is 31.

The square root of 149170081 is about 12213.5204179630. The cubic root of 149170081 is about 530.3475600916.

The spelling of 149170081 in words is "one hundred forty-nine million, one hundred seventy thousand, eighty-one".