155121607 has 2 divisors, whose sum is σ = 155121608. Its totient is φ = 155121606.

The previous prime is 155121559. The next prime is 155121611. The reversal of 155121607 is 706121551.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 155121607 - 2²⁷ = 20903879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155121647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77560803 + 77560804.

It is an arithmetic number, because the mean of its divisors is an integer number (77560804).

Almost surely, 2^155121607 is an apocalyptic number.

155121607 is a deficient number, since it is larger than the sum of its proper divisors (1).

155121607 is an equidigital number, since it uses as much as digits as its factorization.

155121607 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2100, while the sum is 28.

The square root of 155121607 is about 12454.7824950900. The cubic root of 155121607 is about 537.3089793184.

The spelling of 155121607 in words is "one hundred fifty-five million, one hundred twenty-one thousand, six hundred seven".