149217819 has 8 divisors (see below), whose sum is σ = 203809872. Its totient is φ = 97052160.

The previous prime is 149217799. The next prime is 149217829. The reversal of 149217819 is 918712941.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 149217819 - 2¹¹ = 149215771 is a prime.

It is a super-2 number, since 2×149217819² = 44531915014233522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (149217829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 606454 + ... + 606699.

It is an arithmetic number, because the mean of its divisors is an integer number (25476234).

Almost surely, 2^149217819 is an apocalyptic number.

149217819 is a deficient number, since it is larger than the sum of its proper divisors (54592053).

149217819 is a wasteful number, since it uses less digits than its factorization.

149217819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1213197.

The product of its digits is 36288, while the sum is 42.

The square root of 149217819 is about 12215.4745712150. The cubic root of 149217819 is about 530.4041286996.

The spelling of 149217819 in words is "one hundred forty-nine million, two hundred seventeen thousand, eight hundred nineteen".