155616397 has 2 divisors, whose sum is σ = 155616398. Its totient is φ = 155616396.

The previous prime is 155616371. The next prime is 155616449. The reversal of 155616397 is 793616551.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 154480041 + 1136356 = 12429^2 + 1066^2 .

It is a cyclic number.

It is not a de Polignac number, because 155616397 - 2¹⁵ = 155583629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155616337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77808198 + 77808199.

It is an arithmetic number, because the mean of its divisors is an integer number (77808199).

Almost surely, 2^155616397 is an apocalyptic number.

It is an amenable number.

155616397 is a deficient number, since it is larger than the sum of its proper divisors (1).

155616397 is an equidigital number, since it uses as much as digits as its factorization.

155616397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 170100, while the sum is 43.

The square root of 155616397 is about 12474.6301347976. The cubic root of 155616397 is about 537.8796561992.

The spelling of 155616397 in words is "one hundred fifty-five million, six hundred sixteen thousand, three hundred ninety-seven".