155513023 has 2 divisors, whose sum is σ = 155513024. Its totient is φ = 155513022.

The previous prime is 155513021. The next prime is 155513027. The reversal of 155513023 is 320315551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 155513023 - 2¹ = 155513021 is a prime.

Together with 155513021, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155513021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77756511 + 77756512.

It is an arithmetic number, because the mean of its divisors is an integer number (77756512).

Almost surely, 2^155513023 is an apocalyptic number.

155513023 is a deficient number, since it is larger than the sum of its proper divisors (1).

155513023 is an equidigital number, since it uses as much as digits as its factorization.

155513023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2250, while the sum is 25.

The square root of 155513023 is about 12470.4860771343. The cubic root of 155513023 is about 537.7605276042.

Adding to 155513023 its reverse (320315551), we get a palindrome (475828574).

The spelling of 155513023 in words is "one hundred fifty-five million, five hundred thirteen thousand, twenty-three".