155113997 has 2 divisors, whose sum is σ = 155113998. Its totient is φ = 155113996.

The previous prime is 155113991. The next prime is 155114017. The reversal of 155113997 is 799311551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 155102116 + 11881 = 12454^2 + 109^2 .

It is a cyclic number.

It is not a de Polignac number, because 155113997 - 2⁸ = 155113741 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155113991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77556998 + 77556999.

It is an arithmetic number, because the mean of its divisors is an integer number (77556999).

Almost surely, 2^155113997 is an apocalyptic number.

It is an amenable number.

155113997 is a deficient number, since it is larger than the sum of its proper divisors (1).

155113997 is an equidigital number, since it uses as much as digits as its factorization.

155113997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42525, while the sum is 41.

The square root of 155113997 is about 12454.4769862086. The cubic root of 155113997 is about 537.3001926890.

The spelling of 155113997 in words is "one hundred fifty-five million, one hundred thirteen thousand, nine hundred ninety-seven".