155438237 has 2 divisors, whose sum is σ = 155438238. Its totient is φ = 155438236.

The previous prime is 155438203. The next prime is 155438263. The reversal of 155438237 is 732834551.

155438237 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 144817156 + 10621081 = 12034^2 + 3259^2 .

It is a cyclic number.

It is not a de Polignac number, because 155438237 - 2¹² = 155434141 is a prime.

It is a super-2 number, since 2×155438237² = 48322091043336338, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 155438237.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155438287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77719118 + 77719119.

It is an arithmetic number, because the mean of its divisors is an integer number (77719119).

Almost surely, 2^155438237 is an apocalyptic number.

It is an amenable number.

155438237 is a deficient number, since it is larger than the sum of its proper divisors (1).

155438237 is an equidigital number, since it uses as much as digits as its factorization.

155438237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 100800, while the sum is 38.

The square root of 155438237 is about 12467.4871967049. The cubic root of 155438237 is about 537.6743110149.

The spelling of 155438237 in words is "one hundred fifty-five million, four hundred thirty-eight thousand, two hundred thirty-seven".