155474447 has 4 divisors (see below), whose sum is σ = 155606616. Its totient is φ = 155342280.

The previous prime is 155474443. The next prime is 155474467. The reversal of 155474447 is 744474551.

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 155474447 - 2² = 155474443 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 (155474443) 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, 64304 + ... + 66677.

It is an arithmetic number, because the mean of its divisors is an integer number (38901654).

Almost surely, 2^155474447 is an apocalyptic number.

155474447 is a deficient number, since it is larger than the sum of its proper divisors (132169).

155474447 is a wasteful number, since it uses less digits than its factorization.

155474447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132168.

The product of its digits is 313600, while the sum is 41.

The square root of 155474447 is about 12468.9392892900. The cubic root of 155474447 is about 537.7160589477.

The spelling of 155474447 in words is "one hundred fifty-five million, four hundred seventy-four thousand, four hundred forty-seven".