155312449 has 4 divisors (see below), whose sum is σ = 160322560. Its totient is φ = 150302340.

The previous prime is 155312413. The next prime is 155312471. The reversal of 155312449 is 944213551.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 944213551 = 4621 ⋅204331.

It is a cyclic number.

It is not a de Polignac number, because 155312449 - 2¹¹ = 155310401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155312749) 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, 2505009 + ... + 2505070.

It is an arithmetic number, because the mean of its divisors is an integer number (40080640).

Almost surely, 2^155312449 is an apocalyptic number.

It is an amenable number.

155312449 is a deficient number, since it is larger than the sum of its proper divisors (5010111).

155312449 is an equidigital number, since it uses as much as digits as its factorization.

155312449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5010110.

The product of its digits is 21600, while the sum is 34.

The square root of 155312449 is about 12462.4415344667. The cubic root of 155312449 is about 537.5292346818.

The spelling of 155312449 in words is "one hundred fifty-five million, three hundred twelve thousand, four hundred forty-nine".