149865881 has 12 divisors (see below), whose sum is σ = 170412900. Its totient is φ = 131540640.

The previous prime is 149865869. The next prime is 149865883. The reversal of 149865881 is 188568941.

149865881 = T₁₅₁₃ + T₁₅₁₄ + ... + T₁₆₃₃.

It can be written as a sum of positive squares in 2 ways, for example, as 55950400 + 93915481 = 7480^2 + 9691^2 .

It is not a de Polignac number, because 149865881 - 2⁶ = 149865817 is a prime.

It is a super-2 number, since 2×149865881² = 44919564575812322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (149865883) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17846 + ... + 24863.

It is an arithmetic number, because the mean of its divisors is an integer number (14201075).

Almost surely, 2^149865881 is an apocalyptic number.

149865881 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

149865881 is a deficient number, since it is larger than the sum of its proper divisors (20547019).

149865881 is a wasteful number, since it uses less digits than its factorization.

149865881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42760 (or 42749 counting only the distinct ones).

The product of its digits is 552960, while the sum is 50.

The square root of 149865881 is about 12241.9721041996. The cubic root of 149865881 is about 531.1708788096.

The spelling of 149865881 in words is "one hundred forty-nine million, eight hundred sixty-five thousand, eight hundred eighty-one".