148615591 has 4 divisors (see below), whose sum is σ = 148640184. Its totient is φ = 148591000.

The previous prime is 148615583. The next prime is 148615609. The reversal of 148615591 is 195516841.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 148615591 - 2³ = 148615583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (148615531) 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, 3741 + ... + 17641.

It is an arithmetic number, because the mean of its divisors is an integer number (37160046).

Almost surely, 2^148615591 is an apocalyptic number.

148615591 is a deficient number, since it is larger than the sum of its proper divisors (24593).

148615591 is a wasteful number, since it uses less digits than its factorization.

148615591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24592.

The product of its digits is 43200, while the sum is 40.

The square root of 148615591 is about 12190.7994405617. The cubic root of 148615591 is about 529.6896141572.

The spelling of 148615591 in words is "one hundred forty-eight million, six hundred fifteen thousand, five hundred ninety-one".