155131429 has 2 divisors, whose sum is σ = 155131430. Its totient is φ = 155131428.

The previous prime is 155131373. The next prime is 155131507. The reversal of 155131429 is 924131551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 146458404 + 8673025 = 12102^2 + 2945^2 .

It is a cyclic number.

It is not a de Polignac number, because 155131429 - 2¹³ = 155123237 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 155131429.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155131129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77565714 + 77565715.

It is an arithmetic number, because the mean of its divisors is an integer number (77565715).

Almost surely, 2^155131429 is an apocalyptic number.

It is an amenable number.

155131429 is a deficient number, since it is larger than the sum of its proper divisors (1).

155131429 is an equidigital number, since it uses as much as digits as its factorization.

155131429 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5400, while the sum is 31.

The square root of 155131429 is about 12455.1767952125. The cubic root of 155131429 is about 537.3203195340.

The spelling of 155131429 in words is "one hundred fifty-five million, one hundred thirty-one thousand, four hundred twenty-nine".