155339969 has 4 divisors (see below), whose sum is σ = 157658544. Its totient is φ = 153021396.

The previous prime is 155339963. The next prime is 155339983. The reversal of 155339969 is 969933551.

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 an emirpimes, since its reverse is a distinct semiprime: 969933551 = 151 ⋅6423401.

It is a cyclic number.

It is not a de Polignac number, because 155339969 - 2⁸ = 155339713 is a prime.

It is a super-2 number, since 2×155339969² = 48261011937841922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155339963) 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, 1159187 + ... + 1159320.

It is an arithmetic number, because the mean of its divisors is an integer number (39414636).

Almost surely, 2^155339969 is an apocalyptic number.

It is an amenable number.

155339969 is a deficient number, since it is larger than the sum of its proper divisors (2318575).

155339969 is an equidigital number, since it uses as much as digits as its factorization.

155339969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2318574.

The product of its digits is 984150, while the sum is 50.

The square root of 155339969 is about 12463.5456030778. The cubic root of 155339969 is about 537.5609812910.

The spelling of 155339969 in words is "one hundred fifty-five million, three hundred thirty-nine thousand, nine hundred sixty-nine".