149215819 has 2 divisors, whose sum is σ = 149215820. Its totient is φ = 149215818.

The previous prime is 149215771. The next prime is 149215841. The reversal of 149215819 is 918512941.

149215819 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-149215819 is a prime.

It is a super-2 number, since 2×149215819² = 44530721279681522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (149215019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74607909 + 74607910.

It is an arithmetic number, because the mean of its divisors is an integer number (74607910).

Almost surely, 2^149215819 is an apocalyptic number.

149215819 is a deficient number, since it is larger than the sum of its proper divisors (1).

149215819 is an equidigital number, since it uses as much as digits as its factorization.

149215819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 40.

The square root of 149215819 is about 12215.3927075637. The cubic root of 149215819 is about 530.4017589804.

The spelling of 149215819 in words is "one hundred forty-nine million, two hundred fifteen thousand, eight hundred nineteen".