155131723 has 4 divisors (see below), whose sum is σ = 157674928. Its totient is φ = 152588520.

The previous prime is 155131721. The next prime is 155131727. The reversal of 155131723 is 327131551.

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

It is a cyclic number.

It is not a de Polignac number, because 155131723 - 2¹ = 155131721 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 155131691 and 155131700.

It is not an unprimeable number, because it can be changed into a prime (155131721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1271511 + ... + 1271632.

It is an arithmetic number, because the mean of its divisors is an integer number (39418732).

Almost surely, 2^155131723 is an apocalyptic number.

155131723 is a deficient number, since it is larger than the sum of its proper divisors (2543205).

155131723 is an equidigital number, since it uses as much as digits as its factorization.

155131723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2543204.

The product of its digits is 3150, while the sum is 28.

The square root of 155131723 is about 12455.1885975283. The cubic root of 155131723 is about 537.3206589711.

The spelling of 155131723 in words is "one hundred fifty-five million, one hundred thirty-one thousand, seven hundred twenty-three".