155511497 has 2 divisors, whose sum is σ = 155511498. Its totient is φ = 155511496.

The previous prime is 155511463. The next prime is 155511527. The reversal of 155511497 is 794115551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 152497801 + 3013696 = 12349^2 + 1736^2 .

It is a cyclic number.

It is not a de Polignac number, because 155511497 - 2⁸ = 155511241 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 155511497.

It is not a weakly prime, because it can be changed into another prime (155511457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77755748 + 77755749.

It is an arithmetic number, because the mean of its divisors is an integer number (77755749).

Almost surely, 2^155511497 is an apocalyptic number.

It is an amenable number.

155511497 is a deficient number, since it is larger than the sum of its proper divisors (1).

155511497 is an equidigital number, since it uses as much as digits as its factorization.

155511497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31500, while the sum is 38.

The square root of 155511497 is about 12470.4248925207. The cubic root of 155511497 is about 537.7587686406.

The spelling of 155511497 in words is "one hundred fifty-five million, five hundred eleven thousand, four hundred ninety-seven".