155230897 has 2 divisors, whose sum is σ = 155230898. Its totient is φ = 155230896.

The previous prime is 155230883. The next prime is 155230913. The reversal of 155230897 is 798032551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 155151936 + 78961 = 12456^2 + 281^2 .

It is an emirp because it is prime and its reverse (798032551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 155230897 - 2¹¹ = 155228849 is a prime.

It is not a weakly prime, because it can be changed into another prime (155230807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77615448 + 77615449.

It is an arithmetic number, because the mean of its divisors is an integer number (77615449).

Almost surely, 2^155230897 is an apocalyptic number.

It is an amenable number.

155230897 is a deficient number, since it is larger than the sum of its proper divisors (1).

155230897 is an equidigital number, since it uses as much as digits as its factorization.

155230897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 75600, while the sum is 40.

The square root of 155230897 is about 12459.1691938106. The cubic root of 155230897 is about 537.4351356376.

The spelling of 155230897 in words is "one hundred fifty-five million, two hundred thirty thousand, eight hundred ninety-seven".