155015213 has 4 divisors (see below), whose sum is σ = 157556508. Its totient is φ = 152473920.

The previous prime is 155015207. The next prime is 155015227. The reversal of 155015213 is 312510551.

It is a happy number.

155015213 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 73239364 + 81775849 = 8558^2 + 9043^2 .

It is a cyclic number.

It is not a de Polignac number, because 155015213 - 2¹⁶ = 154949677 is a prime.

It is a super-2 number, since 2×155015213² = 48059432522870738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155015233) 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, 1270556 + ... + 1270677.

It is an arithmetic number, because the mean of its divisors is an integer number (39389127).

Almost surely, 2^155015213 is an apocalyptic number.

It is an amenable number.

155015213 is a deficient number, since it is larger than the sum of its proper divisors (2541295).

155015213 is an equidigital number, since it uses as much as digits as its factorization.

155015213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2541294.

The product of its (nonzero) digits is 750, while the sum is 23.

The square root of 155015213 is about 12450.5105517806. The cubic root of 155015213 is about 537.1861089947.

Adding to 155015213 its reverse (312510551), we get a palindrome (467525764).

The spelling of 155015213 in words is "one hundred fifty-five million, fifteen thousand, two hundred thirteen".