155781316 has 6 divisors (see below), whose sum is σ = 272617310. Its totient is φ = 77890656.

The previous prime is 155781287. The next prime is 155781337. The reversal of 155781316 is 613187551.

It can be written as a sum of positive squares in only one way, i.e., 139004100 + 16777216 = 11790^2 + 4096^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19472661 + ... + 19472668.

Almost surely, 2^155781316 is an apocalyptic number.

It is an amenable number.

155781316 is a deficient number, since it is larger than the sum of its proper divisors (116835994).

155781316 is a wasteful number, since it uses less digits than its factorization.

155781316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38945333 (or 38945331 counting only the distinct ones).

The product of its digits is 25200, while the sum is 37.

The square root of 155781316 is about 12481.2385603353. The cubic root of 155781316 is about 538.0696003155.

The spelling of 155781316 in words is "one hundred fifty-five million, seven hundred eighty-one thousand, three hundred sixteen".