155120403 has 4 divisors (see below), whose sum is σ = 206827208. Its totient is φ = 103413600.

The previous prime is 155120387. The next prime is 155120419. The reversal of 155120403 is 304021551.

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 (155120387) and next prime (155120419).

It is not a de Polignac number, because 155120403 - 2⁴ = 155120387 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 155120403.

It is not an unprimeable number, because it can be changed into a prime (155120423) 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, 25853398 + ... + 25853403.

It is an arithmetic number, because the mean of its divisors is an integer number (51706802).

Almost surely, 2^155120403 is an apocalyptic number.

155120403 is a deficient number, since it is larger than the sum of its proper divisors (51706805).

155120403 is an equidigital number, since it uses as much as digits as its factorization.

155120403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51706804.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 155120403 is about 12454.7341601497. The cubic root of 155120403 is about 537.3075891796.

Adding to 155120403 its reverse (304021551), we get a palindrome (459141954).

The spelling of 155120403 in words is "one hundred fifty-five million, one hundred twenty thousand, four hundred three".