149109172789 has 2 divisors, whose sum is σ = 149109172790. Its totient is φ = 149109172788.

The previous prime is 149109172759. The next prime is 149109172829. The reversal of 149109172789 is 987271901941.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 108476692164 + 40632480625 = 329358^2 + 201575^2 .

It is a cyclic number.

It is not a de Polignac number, because 149109172789 - 2³¹ = 146961689141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (149109172759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74554586394 + 74554586395.

It is an arithmetic number, because the mean of its divisors is an integer number (74554586395).

Almost surely, 2^149109172789 is an apocalyptic number.

It is an amenable number.

149109172789 is a deficient number, since it is larger than the sum of its proper divisors (1).

149109172789 is an equidigital number, since it uses as much as digits as its factorization.

149109172789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2286144, while the sum is 58.

The spelling of 149109172789 in words is "one hundred forty-nine billion, one hundred nine million, one hundred seventy-two thousand, seven hundred eighty-nine".