155995493 has 4 divisors (see below), whose sum is σ = 156248940. Its totient is φ = 155742048.

The previous prime is 155995481. The next prime is 155995501. The reversal of 155995493 is 394599551.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8567329 + 147428164 = 2927^2 + 12142^2 .

It is a cyclic number.

It is not a de Polignac number, because 155995493 - 2¹² = 155991397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155995093) 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 in 3 ways as a sum of consecutive naturals, for example, 125798 + ... + 127031.

It is an arithmetic number, because the mean of its divisors is an integer number (39062235).

Almost surely, 2^155995493 is an apocalyptic number.

It is an amenable number.

155995493 is a deficient number, since it is larger than the sum of its proper divisors (253447).

155995493 is an equidigital number, since it uses as much as digits as its factorization.

155995493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253446.

The product of its digits is 1093500, while the sum is 50.

The square root of 155995493 is about 12489.8155710963. The cubic root of 155995493 is about 538.3160769410.

The spelling of 155995493 in words is "one hundred fifty-five million, nine hundred ninety-five thousand, four hundred ninety-three".