149857811 has 4 divisors (see below), whose sum is σ = 156373392. Its totient is φ = 143342232.

The previous prime is 149857753. The next prime is 149857853. The reversal of 149857811 is 118758941.

It is a happy number.

149857811 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 118758941 = 7 ⋅16965563.

It is a cyclic number.

It is not a de Polignac number, because 149857811 - 2¹⁰ = 149856787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (149857891) 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, 3257756 + ... + 3257801.

It is an arithmetic number, because the mean of its divisors is an integer number (39093348).

Almost surely, 2^149857811 is an apocalyptic number.

149857811 is a deficient number, since it is larger than the sum of its proper divisors (6515581).

149857811 is an equidigital number, since it uses as much as digits as its factorization.

149857811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6515580.

The product of its digits is 80640, while the sum is 44.

The square root of 149857811 is about 12241.6424960052. The cubic root of 149857811 is about 531.1613444493.

The spelling of 149857811 in words is "one hundred forty-nine million, eight hundred fifty-seven thousand, eight hundred eleven".