155105903 has 2 divisors, whose sum is σ = 155105904. Its totient is φ = 155105902.

The previous prime is 155105893. The next prime is 155105921. The reversal of 155105903 is 309501551.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 155105903 - 2⁸ = 155105647 is a prime.

It is a super-2 number, since 2×155105903² = 48115682290890818, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155105933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77552951 + 77552952.

It is an arithmetic number, because the mean of its divisors is an integer number (77552952).

Almost surely, 2^155105903 is an apocalyptic number.

155105903 is a deficient number, since it is larger than the sum of its proper divisors (1).

155105903 is an equidigital number, since it uses as much as digits as its factorization.

155105903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3375, while the sum is 29.

The square root of 155105903 is about 12454.1520385773. The cubic root of 155105903 is about 537.2908469100.

The spelling of 155105903 in words is "one hundred fifty-five million, one hundred five thousand, nine hundred three".