155878313 has 2 divisors, whose sum is σ = 155878314. Its totient is φ = 155878312.

The previous prime is 155878309. The next prime is 155878343. The reversal of 155878313 is 313878551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 152448409 + 3429904 = 12347^2 + 1852^2 .

It is a cyclic number.

It is not a de Polignac number, because 155878313 - 2² = 155878309 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (155878343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77939156 + 77939157.

It is an arithmetic number, because the mean of its divisors is an integer number (77939157).

Almost surely, 2^155878313 is an apocalyptic number.

It is an amenable number.

155878313 is a deficient number, since it is larger than the sum of its proper divisors (1).

155878313 is an equidigital number, since it uses as much as digits as its factorization.

155878313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 100800, while the sum is 41.

The square root of 155878313 is about 12485.1236677896. The cubic root of 155878313 is about 538.1812532185.

The spelling of 155878313 in words is "one hundred fifty-five million, eight hundred seventy-eight thousand, three hundred thirteen".