155321137 has 4 divisors (see below), whose sum is σ = 157192560. Its totient is φ = 153449716.

The previous prime is 155321123. The next prime is 155321141. The reversal of 155321137 is 731123551.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 155321137 - 2¹⁵ = 155288369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155421137) 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, 935587 + ... + 935752.

It is an arithmetic number, because the mean of its divisors is an integer number (39298140).

Almost surely, 2^155321137 is an apocalyptic number.

It is an amenable number.

155321137 is a deficient number, since it is larger than the sum of its proper divisors (1871423).

155321137 is an equidigital number, since it uses as much as digits as its factorization.

155321137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1871422.

The product of its digits is 3150, while the sum is 28.

The square root of 155321137 is about 12462.7900969245. The cubic root of 155321137 is about 537.5392574175.

Adding to 155321137 its reverse (731123551), we get a palindrome (886444688).

The spelling of 155321137 in words is "one hundred fifty-five million, three hundred twenty-one thousand, one hundred thirty-seven".