155641697 has 2 divisors, whose sum is σ = 155641698. Its totient is φ = 155641696.

The previous prime is 155641693. The next prime is 155641709. The reversal of 155641697 is 796146551.

155641697 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127328656 + 28313041 = 11284^2 + 5321^2 .

It is an emirp because it is prime and its reverse (796146551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 155641697 - 2² = 155641693 is a prime.

It is not a weakly prime, because it can be changed into another prime (155641693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77820848 + 77820849.

It is an arithmetic number, because the mean of its divisors is an integer number (77820849).

Almost surely, 2^155641697 is an apocalyptic number.

It is an amenable number.

155641697 is a deficient number, since it is larger than the sum of its proper divisors (1).

155641697 is an equidigital number, since it uses as much as digits as its factorization.

155641697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 226800, while the sum is 44.

The square root of 155641697 is about 12475.6441517062. The cubic root of 155641697 is about 537.9088039800.

The spelling of 155641697 in words is "one hundred fifty-five million, six hundred forty-one thousand, six hundred ninety-seven".