149611381 has 4 divisors (see below), whose sum is σ = 149663500. Its totient is φ = 149559264.

The previous prime is 149611379. The next prime is 149611393. The reversal of 149611381 is 183116941.

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 6426225 + 143185156 = 2535^2 + 11966^2 .

It is a cyclic number.

It is not a de Polignac number, because 149611381 - 2¹ = 149611379 is a prime.

It is a super-2 number, since 2×149611381² = 44767130649454322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (149611321) 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, 21486 + ... + 27583.

It is an arithmetic number, because the mean of its divisors is an integer number (37415875).

Almost surely, 2^149611381 is an apocalyptic number.

It is an amenable number.

149611381 is a deficient number, since it is larger than the sum of its proper divisors (52119).

149611381 is an equidigital number, since it uses as much as digits as its factorization.

149611381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52118.

The product of its digits is 5184, while the sum is 34.

The square root of 149611381 is about 12231.5731204126. The cubic root of 149611381 is about 530.8700329645.

The spelling of 149611381 in words is "one hundred forty-nine million, six hundred eleven thousand, three hundred eighty-one".