149131217 has 2 divisors, whose sum is σ = 149131218. Its totient is φ = 149131216.

The previous prime is 149131211. The next prime is 149131261. The reversal of 149131217 is 712131941.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 128845201 + 20286016 = 11351^2 + 4504^2 .

It is a cyclic number.

It is not a de Polignac number, because 149131217 - 2¹⁶ = 149065681 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 149131217.

It is not a weakly prime, because it can be changed into another prime (149131211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74565608 + 74565609.

It is an arithmetic number, because the mean of its divisors is an integer number (74565609).

Almost surely, 2^149131217 is an apocalyptic number.

It is an amenable number.

149131217 is a deficient number, since it is larger than the sum of its proper divisors (1).

149131217 is an equidigital number, since it uses as much as digits as its factorization.

149131217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1512, while the sum is 29.

The square root of 149131217 is about 12211.9292906567. The cubic root of 149131217 is about 530.3014980893.

The spelling of 149131217 in words is "one hundred forty-nine million, one hundred thirty-one thousand, two hundred seventeen".