155191447 has 4 divisors (see below), whose sum is σ = 155243416. Its totient is φ = 155139480.

The previous prime is 155191433. The next prime is 155191451. The reversal of 155191447 is 744191551.

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 155191447 - 2⁷ = 155191319 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 (155191427) 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, 21213 + ... + 27574.

It is an arithmetic number, because the mean of its divisors is an integer number (38810854).

Almost surely, 2^155191447 is an apocalyptic number.

155191447 is a deficient number, since it is larger than the sum of its proper divisors (51969).

155191447 is an equidigital number, since it uses as much as digits as its factorization.

155191447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51968.

The product of its digits is 25200, while the sum is 37.

The square root of 155191447 is about 12457.5859218389. The cubic root of 155191447 is about 537.3896042972.

The spelling of 155191447 in words is "one hundred fifty-five million, one hundred ninety-one thousand, four hundred forty-seven".