155404969 has 4 divisors (see below), whose sum is σ = 155430144. Its totient is φ = 155379796.

The previous prime is 155404943. The next prime is 155404987. The reversal of 155404969 is 969404551.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 969404551 = 37 ⋅26200123.

It is a cyclic number.

It is not a de Polignac number, because 155404969 - 2¹¹ = 155402921 is a prime.

It is a super-2 number, since 2×155404969² = 48301408779781922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155408969) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3684 + ... + 18010.

It is an arithmetic number, because the mean of its divisors is an integer number (38857536).

Almost surely, 2^155404969 is an apocalyptic number.

It is an amenable number.

155404969 is a deficient number, since it is larger than the sum of its proper divisors (25175).

155404969 is a wasteful number, since it uses less digits than its factorization.

155404969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25174.

The product of its (nonzero) digits is 194400, while the sum is 43.

The square root of 155404969 is about 12466.1529350478. The cubic root of 155404969 is about 537.6359493145.

The spelling of 155404969 in words is "one hundred fifty-five million, four hundred four thousand, nine hundred sixty-nine".