149771789 has 4 divisors (see below), whose sum is σ = 151254780. Its totient is φ = 148288800.

The previous prime is 149771773. The next prime is 149771827. The reversal of 149771789 is 987177941.

It is a happy number.

149771789 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.

It can be written as a sum of positive squares in 2 ways, for example, as 71537764 + 78234025 = 8458^2 + 8845^2 .

It is a cyclic number.

It is not a de Polignac number, because 149771789 - 2⁴ = 149771773 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 149771789.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (149771719) 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, 741344 + ... + 741545.

It is an arithmetic number, because the mean of its divisors is an integer number (37813695).

Almost surely, 2^149771789 is an apocalyptic number.

It is an amenable number.

149771789 is a deficient number, since it is larger than the sum of its proper divisors (1482991).

149771789 is a wasteful number, since it uses less digits than its factorization.

149771789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1482990.

The product of its digits is 889056, while the sum is 53.

The square root of 149771789 is about 12238.1284925433. The cubic root of 149771789 is about 531.0596918531.

The spelling of 149771789 in words is "one hundred forty-nine million, seven hundred seventy-one thousand, seven hundred eighty-nine".