155251447 has 4 divisors (see below), whose sum is σ = 167193880. Its totient is φ = 143309016.

The previous prime is 155251433. The next prime is 155251487. The reversal of 155251447 is 744152551.

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 155251447 - 2⁷ = 155251319 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 (155251427) 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, 5971197 + ... + 5971222.

It is an arithmetic number, because the mean of its divisors is an integer number (41798470).

Almost surely, 2^155251447 is an apocalyptic number.

155251447 is a deficient number, since it is larger than the sum of its proper divisors (11942433).

155251447 is a wasteful number, since it uses less digits than its factorization.

155251447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11942432.

The product of its digits is 28000, while the sum is 34.

The square root of 155251447 is about 12459.9938603516. The cubic root of 155251447 is about 537.4588504283.

The spelling of 155251447 in words is "one hundred fifty-five million, two hundred fifty-one thousand, four hundred forty-seven".