148815191 has 4 divisors (see below), whose sum is σ = 170074512. Its totient is φ = 127555872.

The previous prime is 148815157. The next prime is 148815253. The reversal of 148815191 is 191518841.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 148815191 - 2¹⁸ = 148553047 is a prime.

It is a super-2 number, since 2×148815191² = 44291922144732962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (148815101) 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, 10629650 + ... + 10629663.

It is an arithmetic number, because the mean of its divisors is an integer number (42518628).

Almost surely, 2^148815191 is an apocalyptic number.

148815191 is a deficient number, since it is larger than the sum of its proper divisors (21259321).

148815191 is an equidigital number, since it uses as much as digits as its factorization.

148815191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21259320.

The product of its digits is 11520, while the sum is 38.

The square root of 148815191 is about 12198.9831953323. The cubic root of 148815191 is about 529.9266434607.

The spelling of 148815191 in words is "one hundred forty-eight million, eight hundred fifteen thousand, one hundred ninety-one".