155121469 has 2 divisors, whose sum is σ = 155121470. Its totient is φ = 155121468.

The previous prime is 155121451. The next prime is 155121487. The reversal of 155121469 is 964121551.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (155121451) and next prime (155121487).

It can be written as a sum of positive squares in only one way, i.e., 144913444 + 10208025 = 12038^2 + 3195^2 .

It is an emirp because it is prime and its reverse (964121551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 155121469 - 2⁷ = 155121341 is a prime.

It is a super-2 number, since 2×155121469² = 48125340289435922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155122469) 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, 77560734 + 77560735.

It is an arithmetic number, because the mean of its divisors is an integer number (77560735).

Almost surely, 2^155121469 is an apocalyptic number.

It is an amenable number.

155121469 is a deficient number, since it is larger than the sum of its proper divisors (1).

155121469 is an equidigital number, since it uses as much as digits as its factorization.

155121469 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10800, while the sum is 34.

The square root of 155121469 is about 12454.7769550482. The cubic root of 155121469 is about 537.3088199839.

The spelling of 155121469 in words is "one hundred fifty-five million, one hundred twenty-one thousand, four hundred sixty-nine".