155421316 has 6 divisors (see below), whose sum is σ = 271987310. Its totient is φ = 77710656.

The previous prime is 155421289. The next prime is 155421319. The reversal of 155421316 is 613124551.

It can be written as a sum of positive squares in only one way, i.e., 154902916 + 518400 = 12446^2 + 720^2 .

It is not an unprimeable number, because it can be changed into a prime (155421319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19427661 + ... + 19427668.

Almost surely, 2^155421316 is an apocalyptic number.

It is an amenable number.

155421316 is a deficient number, since it is larger than the sum of its proper divisors (116565994).

155421316 is a wasteful number, since it uses less digits than its factorization.

155421316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38855333 (or 38855331 counting only the distinct ones).

The product of its digits is 3600, while the sum is 28.

The square root of 155421316 is about 12466.8085731674. The cubic root of 155421316 is about 537.6547999059.

Adding to 155421316 its reverse (613124551), we get a palindrome (768545867).

The spelling of 155421316 in words is "one hundred fifty-five million, four hundred twenty-one thousand, three hundred sixteen".