155315399 has 4 divisors (see below), whose sum is σ = 156120336. Its totient is φ = 154510464.

The previous prime is 155315371. The next prime is 155315423. The reversal of 155315399 is 993513551.

155315399 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 993513551 = 27751 ⋅35801.

It is a cyclic number.

It is not a de Polignac number, because 155315399 - 2⁸ = 155315143 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 (155315359) 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, 402179 + ... + 402564.

It is an arithmetic number, because the mean of its divisors is an integer number (39030084).

Almost surely, 2^155315399 is an apocalyptic number.

155315399 is a deficient number, since it is larger than the sum of its proper divisors (804937).

155315399 is an equidigital number, since it uses as much as digits as its factorization.

155315399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 804936.

The product of its digits is 91125, while the sum is 41.

The square root of 155315399 is about 12462.5598895251. The cubic root of 155315399 is about 537.5326379316.

The spelling of 155315399 in words is "one hundred fifty-five million, three hundred fifteen thousand, three hundred ninety-nine".