155391629 has 2 divisors, whose sum is σ = 155391630. Its totient is φ = 155391628.

The previous prime is 155391617. The next prime is 155391641. The reversal of 155391629 is 926193551.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (155391617) and next prime (155391641).

It can be written as a sum of positive squares in only one way, i.e., 146361604 + 9030025 = 12098^2 + 3005^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155391629 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155396629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77695814 + 77695815.

It is an arithmetic number, because the mean of its divisors is an integer number (77695815).

Almost surely, 2^155391629 is an apocalyptic number.

It is an amenable number.

155391629 is a deficient number, since it is larger than the sum of its proper divisors (1).

155391629 is an equidigital number, since it uses as much as digits as its factorization.

155391629 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72900, while the sum is 41.

The square root of 155391629 is about 12465.6178747786. The cubic root of 155391629 is about 537.6205652745.

The spelling of 155391629 in words is "one hundred fifty-five million, three hundred ninety-one thousand, six hundred twenty-nine".