155615279 has 2 divisors, whose sum is σ = 155615280. Its totient is φ = 155615278.

The previous prime is 155615269. The next prime is 155615281. The reversal of 155615279 is 972516551.

It is a strong prime.

It is an emirp because it is prime and its reverse (972516551) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155615279 is a prime.

It is a super-2 number, since 2×155615279² = 48432230116495682, which contains 22 as substring.

Together with 155615281, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155615219) 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 as a sum of consecutive naturals, namely, 77807639 + 77807640.

It is an arithmetic number, because the mean of its divisors is an integer number (77807640).

Almost surely, 2^155615279 is an apocalyptic number.

155615279 is a deficient number, since it is larger than the sum of its proper divisors (1).

155615279 is an equidigital number, since it uses as much as digits as its factorization.

155615279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 94500, while the sum is 41.

The square root of 155615279 is about 12474.5853237693. The cubic root of 155615279 is about 537.8783680940.

The spelling of 155615279 in words is "one hundred fifty-five million, six hundred fifteen thousand, two hundred seventy-nine".