155492681 has 4 divisors (see below), whose sum is σ = 155539332. Its totient is φ = 155446032.

The previous prime is 155492663. The next prime is 155492699. The reversal of 155492681 is 186294551.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (155492663) and next prime (155492699).

It can be written as a sum of positive squares in 2 ways, for example, as 614656 + 154878025 = 784^2 + 12445^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155492681 is a prime.

It is a super-2 number, since 2×155492681² = 48355947689135522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155492641) 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, 17906 + ... + 25131.

It is an arithmetic number, because the mean of its divisors is an integer number (38884833).

Almost surely, 2^155492681 is an apocalyptic number.

It is an amenable number.

155492681 is a deficient number, since it is larger than the sum of its proper divisors (46651).

155492681 is an equidigital number, since it uses as much as digits as its factorization.

155492681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46650.

The product of its digits is 86400, while the sum is 41.

The square root of 155492681 is about 12469.6704447231. The cubic root of 155492681 is about 537.7370791893.

The spelling of 155492681 in words is "one hundred fifty-five million, four hundred ninety-two thousand, six hundred eighty-one".