155902213 has 4 divisors (see below), whose sum is σ = 159704748. Its totient is φ = 152099680.

The previous prime is 155902207. The next prime is 155902247. The reversal of 155902213 is 312209551.

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 38353249 + 117548964 = 6193^2 + 10842^2 .

It is a cyclic number.

It is not a de Polignac number, because 155902213 - 2⁵ = 155902181 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 (155902283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1901206 + ... + 1901287.

It is an arithmetic number, because the mean of its divisors is an integer number (39926187).

Almost surely, 2^155902213 is an apocalyptic number.

It is an amenable number.

155902213 is a deficient number, since it is larger than the sum of its proper divisors (3802535).

155902213 is an equidigital number, since it uses as much as digits as its factorization.

155902213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3802534.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 155902213 is about 12486.0807702017. The cubic root of 155902213 is about 538.2087573110.

The spelling of 155902213 in words is "one hundred fifty-five million, nine hundred two thousand, two hundred thirteen".