155263613 has 2 divisors, whose sum is σ = 155263614. Its totient is φ = 155263612.

The previous prime is 155263579. The next prime is 155263631. The reversal of 155263613 is 316362551.

Together with next prime (155263631) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 142611364 + 12652249 = 11942^2 + 3557^2 .

It is a cyclic number.

It is not a de Polignac number, because 155263613 - 2⁸ = 155263357 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 155263613.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155265613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77631806 + 77631807.

It is an arithmetic number, because the mean of its divisors is an integer number (77631807).

Almost surely, 2^155263613 is an apocalyptic number.

It is an amenable number.

155263613 is a deficient number, since it is larger than the sum of its proper divisors (1).

155263613 is an equidigital number, since it uses as much as digits as its factorization.

155263613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16200, while the sum is 32.

The square root of 155263613 is about 12460.4820532755. The cubic root of 155263613 is about 537.4728890598.

The spelling of 155263613 in words is "one hundred fifty-five million, two hundred sixty-three thousand, six hundred thirteen".