149930809681 has 9 divisors (see below), whose sum is σ = 159276053649. Its totient is φ = 141105154944.

The previous prime is 149930809673. The next prime is 149930809703. The reversal of 149930809681 is 186908039941.

The square root of 149930809681 is 387209.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 71373931281 + 78556878400 = 267159^2 + 280280^2 .

It is not a de Polignac number, because 149930809681 - 2³ = 149930809673 is a prime.

It is a super-2 number, since 2×149930809681² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (149930809621) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 6571165 + ... + 6593941.

Almost surely, 2^149930809681 is an apocalyptic number.

149930809681 is the 387209-th square number.

149930809681 is the 193605-th centered octagonal number.

It is an amenable number.

149930809681 is a deficient number, since it is larger than the sum of its proper divisors (9345243968).

149930809681 is an frugal number, since it uses more digits than its factorization.

149930809681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45588 (or 22794 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 58.

The spelling of 149930809681 in words is "one hundred forty-nine billion, nine hundred thirty million, eight hundred nine thousand, six hundred eighty-one".