155521567 has 2 divisors, whose sum is σ = 155521568. Its totient is φ = 155521566.

The previous prime is 155521549. The next prime is 155521573. The reversal of 155521567 is 765125551.

It is a strong prime.

It is an emirp because it is prime and its reverse (765125551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 155521567 - 2⁷ = 155521439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155591567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77760783 + 77760784.

It is an arithmetic number, because the mean of its divisors is an integer number (77760784).

Almost surely, 2^155521567 is an apocalyptic number.

155521567 is a deficient number, since it is larger than the sum of its proper divisors (1).

155521567 is an equidigital number, since it uses as much as digits as its factorization.

155521567 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52500, while the sum is 37.

The square root of 155521567 is about 12470.8286412732. The cubic root of 155521567 is about 537.7703757437.

The spelling of 155521567 in words is "one hundred fifty-five million, five hundred twenty-one thousand, five hundred sixty-seven".