155264521 has 4 divisors (see below), whose sum is σ = 160618500. Its totient is φ = 149910544.

The previous prime is 155264489. The next prime is 155264533. The reversal of 155264521 is 125462551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 125462551 = 83 ⋅1511597.

It can be written as a sum of positive squares in 2 ways, for example, as 117614025 + 37650496 = 10845^2 + 6136^2 .

It is a cyclic number.

It is not a de Polignac number, because 155264521 - 2⁵ = 155264489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155264821) 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, 2676946 + ... + 2677003.

It is an arithmetic number, because the mean of its divisors is an integer number (40154625).

Almost surely, 2^155264521 is an apocalyptic number.

It is an amenable number.

155264521 is a deficient number, since it is larger than the sum of its proper divisors (5353979).

155264521 is an equidigital number, since it uses as much as digits as its factorization.

155264521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5353978.

The product of its digits is 12000, while the sum is 31.

The square root of 155264521 is about 12460.5184884097. The cubic root of 155264521 is about 537.4739367928.

Adding to 155264521 its product of digits (12000), we get a square (155276521 = 12461²).

The spelling of 155264521 in words is "one hundred fifty-five million, two hundred sixty-four thousand, five hundred twenty-one".