155110997 has 2 divisors, whose sum is σ = 155110998. Its totient is φ = 155110996.

The previous prime is 155110987. The next prime is 155110999. The reversal of 155110997 is 799011551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78127921 + 76983076 = 8839^2 + 8774^2 .

It is a cyclic number.

It is not a de Polignac number, because 155110997 - 2⁸ = 155110741 is a prime.

Together with 155110999, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 155110997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155110999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77555498 + 77555499.

It is an arithmetic number, because the mean of its divisors is an integer number (77555499).

Almost surely, 2^155110997 is an apocalyptic number.

It is an amenable number.

155110997 is a deficient number, since it is larger than the sum of its proper divisors (1).

155110997 is an equidigital number, since it uses as much as digits as its factorization.

155110997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14175, while the sum is 38.

The square root of 155110997 is about 12454.3565470080. The cubic root of 155110997 is about 537.2967287614.

The spelling of 155110997 in words is "one hundred fifty-five million, one hundred ten thousand, nine hundred ninety-seven".