149393551 has 4 divisors (see below), whose sum is σ = 151440112. Its totient is φ = 147346992.

The previous prime is 149393539. The next prime is 149393597. The reversal of 149393551 is 155393941.

149393551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 149393551 - 2⁷ = 149393423 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 (149391551) 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, 1023171 + ... + 1023316.

It is an arithmetic number, because the mean of its divisors is an integer number (37860028).

Almost surely, 2^149393551 is an apocalyptic number.

149393551 is a deficient number, since it is larger than the sum of its proper divisors (2046561).

149393551 is an equidigital number, since it uses as much as digits as its factorization.

149393551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2046560.

The product of its digits is 72900, while the sum is 40.

The square root of 149393551 is about 12222.6654621650. The cubic root of 149393551 is about 530.6122638329.

The spelling of 149393551 in words is "one hundred forty-nine million, three hundred ninety-three thousand, five hundred fifty-one".