155226681 has 9 divisors (see below), whose sum is σ = 224270319. Its totient is φ = 103459536.

The previous prime is 155226623. The next prime is 155226691. The reversal of 155226681 is 186622551.

The square root of 155226681 is 12459.

It is a perfect power (a square), and thus also a powerful number.

155226681 is a `hidden beast` number, since 1 + 552 + 26 + 6 + 81 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1863225 + 153363456 = 1365^2 + 12384^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 155226681 - 2⁷ = 155226553 is a prime.

It is a super-2 number, since 2×155226681² = 48190644988551522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (155226601) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 35301 + ... + 39453.

Almost surely, 2^155226681 is an apocalyptic number.

155226681 is the 12459-th square number.

155226681 is the 6230-th centered octagonal number.

It is an amenable number.

155226681 is a deficient number, since it is larger than the sum of its proper divisors (69043638).

155226681 is an frugal number, since it uses more digits than its factorization.

155226681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8312 (or 4156 counting only the distinct ones).

The product of its digits is 28800, while the sum is 36.

The cubic root of 155226681 is about 537.4302700962.

Multiplying 155226681 by its sum of digits (36), we get a square (5588160516 = 74754²).

The spelling of 155226681 in words is "one hundred fifty-five million, two hundred twenty-six thousand, six hundred eighty-one".