149931811 has 2 divisors, whose sum is σ = 149931812. Its totient is φ = 149931810.

The previous prime is 149931797. The next prime is 149931889. The reversal of 149931811 is 118139941.

It is a weak prime.

It is an emirp because it is prime and its reverse (118139941) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 149931811 - 2¹³ = 149923619 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (149941811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74965905 + 74965906.

It is an arithmetic number, because the mean of its divisors is an integer number (74965906).

Almost surely, 2^149931811 is an apocalyptic number.

149931811 is a deficient number, since it is larger than the sum of its proper divisors (1).

149931811 is an equidigital number, since it uses as much as digits as its factorization.

149931811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 37.

The square root of 149931811 is about 12244.6645932014. The cubic root of 149931811 is about 531.2487594712.

The spelling of 149931811 in words is "one hundred forty-nine million, nine hundred thirty-one thousand, eight hundred eleven".