155421037 has 4 divisors (see below), whose sum is σ = 159211836. Its totient is φ = 151630240.

The previous prime is 155421001. The next prime is 155421103. The reversal of 155421037 is 730124551.

It is a happy number.

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 8259876 + 147161161 = 2874^2 + 12131^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155421037 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 155420996 and 155421014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155421137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1895338 + ... + 1895419.

It is an arithmetic number, because the mean of its divisors is an integer number (39802959).

Almost surely, 2^155421037 is an apocalyptic number.

It is an amenable number.

155421037 is a deficient number, since it is larger than the sum of its proper divisors (3790799).

155421037 is an equidigital number, since it uses as much as digits as its factorization.

155421037 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3790798.

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 155421037 is about 12466.7973834502. The cubic root of 155421037 is about 537.6544781873.

Adding to 155421037 its reverse (730124551), we get a palindrome (885545588).

The spelling of 155421037 in words is "one hundred fifty-five million, four hundred twenty-one thousand, thirty-seven".