1298155 has 4 divisors (see below), whose sum is σ = 1557792. Its totient is φ = 1038520.

The previous prime is 1298149. The next prime is 1298161. The reversal of 1298155 is 5518921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5518921 = 43 ⋅128347.

It is an interprime number because it is at equal distance from previous prime (1298149) and next prime (1298161).

It is not a de Polignac number, because 1298155 - 2⁷ = 1298027 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 129811 + ... + 129820.

It is an arithmetic number, because the mean of its divisors is an integer number (389448).

2^1298155 is an apocalyptic number.

1298155 is a deficient number, since it is larger than the sum of its proper divisors (259637).

1298155 is an equidigital number, since it uses as much as digits as its factorization.

1298155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259636.

The product of its digits is 3600, while the sum is 31.

The square root of 1298155 is about 1139.3660518025. The cubic root of 1298155 is about 109.0876325826.

The spelling of 1298155 in words is "one million, two hundred ninety-eight thousand, one hundred fifty-five".