155504123 has 2 divisors, whose sum is σ = 155504124. Its totient is φ = 155504122.

The previous prime is 155504101. The next prime is 155504137. The reversal of 155504123 is 321405551.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 155504123 - 2¹⁶ = 155438587 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 155504092 and 155504101.

It is not a weakly prime, because it can be changed into another prime (155504023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77752061 + 77752062.

It is an arithmetic number, because the mean of its divisors is an integer number (77752062).

Almost surely, 2^155504123 is an apocalyptic number.

155504123 is a deficient number, since it is larger than the sum of its proper divisors (1).

155504123 is an equidigital number, since it uses as much as digits as its factorization.

155504123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 155504123 is about 12470.1292294827. The cubic root of 155504123 is about 537.7502687421.

Adding to 155504123 its reverse (321405551), we get a palindrome (476909674).

The spelling of 155504123 in words is "one hundred fifty-five million, five hundred four thousand, one hundred twenty-three".