155638697 has 2 divisors, whose sum is σ = 155638698. Its totient is φ = 155638696.

The previous prime is 155638673. The next prime is 155638711. The reversal of 155638697 is 796836551.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 144456361 + 11182336 = 12019^2 + 3344^2 .

It is a cyclic number.

It is not a de Polignac number, because 155638697 - 2¹⁶ = 155573161 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (155638657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77819348 + 77819349.

It is an arithmetic number, because the mean of its divisors is an integer number (77819349).

Almost surely, 2^155638697 is an apocalyptic number.

It is an amenable number.

155638697 is a deficient number, since it is larger than the sum of its proper divisors (1).

155638697 is an equidigital number, since it uses as much as digits as its factorization.

155638697 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1360800, while the sum is 50.

The square root of 155638697 is about 12475.5239168542. The cubic root of 155638697 is about 537.9053478865.

The spelling of 155638697 in words is "one hundred fifty-five million, six hundred thirty-eight thousand, six hundred ninety-seven".