155715447 has 4 divisors (see below), whose sum is σ = 207620600. Its totient is φ = 103810296.

The previous prime is 155715419. The next prime is 155715457. The reversal of 155715447 is 744517551.

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

It is not a de Polignac number, because 155715447 - 2⁶ = 155715383 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 (155715407) 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 3 ways as a sum of consecutive naturals, for example, 25952572 + ... + 25952577.

It is an arithmetic number, because the mean of its divisors is an integer number (51905150).

Almost surely, 2^155715447 is an apocalyptic number.

155715447 is a deficient number, since it is larger than the sum of its proper divisors (51905153).

155715447 is an equidigital number, since it uses as much as digits as its factorization.

155715447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51905152.

The product of its digits is 98000, while the sum is 39.

The square root of 155715447 is about 12478.5995608482. The cubic root of 155715447 is about 537.9937523171.

The spelling of 155715447 in words is "one hundred fifty-five million, seven hundred fifteen thousand, four hundred forty-seven".