155911493 has 4 divisors (see below), whose sum is σ = 160940928. Its totient is φ = 150882060.

The previous prime is 155911489. The next prime is 155911499. The reversal of 155911493 is 394119551.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 155911493 - 2² = 155911489 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 (155911499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2514671 + ... + 2514732.

It is an arithmetic number, because the mean of its divisors is an integer number (40235232).

Almost surely, 2^155911493 is an apocalyptic number.

It is an amenable number.

155911493 is a deficient number, since it is larger than the sum of its proper divisors (5029435).

155911493 is an equidigital number, since it uses as much as digits as its factorization.

155911493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5029434.

The product of its digits is 24300, while the sum is 38.

The square root of 155911493 is about 12486.4523784780. The cubic root of 155911493 is about 538.2194359667.

The spelling of 155911493 in words is "one hundred fifty-five million, nine hundred eleven thousand, four hundred ninety-three".