155162213 has 4 divisors (see below), whose sum is σ = 164289420. Its totient is φ = 146035008.

The previous prime is 155162207. The next prime is 155162219. The reversal of 155162213 is 312261551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 312261551 = 7 ⋅44608793.

It is an interprime number because it is at equal distance from previous prime (155162207) and next prime (155162219).

It can be written as a sum of positive squares in 2 ways, for example, as 48205249 + 106956964 = 6943^2 + 10342^2 .

It is a cyclic number.

It is not a de Polignac number, because 155162213 - 2⁶ = 155162149 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 (155162219) 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, 4563578 + ... + 4563611.

It is an arithmetic number, because the mean of its divisors is an integer number (41072355).

Almost surely, 2^155162213 is an apocalyptic number.

It is an amenable number.

155162213 is a deficient number, since it is larger than the sum of its proper divisors (9127207).

155162213 is an equidigital number, since it uses as much as digits as its factorization.

155162213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9127206.

The product of its digits is 1800, while the sum is 26.

The square root of 155162213 is about 12456.4125252819. The cubic root of 155162213 is about 537.3558588072.

The spelling of 155162213 in words is "one hundred fifty-five million, one hundred sixty-two thousand, two hundred thirteen".