149767981 has 8 divisors (see below), whose sum is σ = 165822624. Its totient is φ = 134119920.

The previous prime is 149767967. The next prime is 149767987. The reversal of 149767981 is 189767941.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 149767981 - 2¹¹ = 149765933 is a prime.

It is a super-2 number, since 2×149767981² = 44860896265632722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (149767987) 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, 100870 + ... + 102343.

It is an arithmetic number, because the mean of its divisors is an integer number (20727828).

Almost surely, 2^149767981 is an apocalyptic number.

149767981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

149767981 is a deficient number, since it is larger than the sum of its proper divisors (16054643).

149767981 is a wasteful number, since it uses less digits than its factorization.

149767981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203291.

The product of its digits is 762048, while the sum is 52.

The square root of 149767981 is about 12237.9729122106. The cubic root of 149767981 is about 531.0551910223.

The spelling of 149767981 in words is "one hundred forty-nine million, seven hundred sixty-seven thousand, nine hundred eighty-one".