1249518055 has 4 divisors (see below), whose sum is σ = 1499421672. Its totient is φ = 999614440.

The previous prime is 1249518031. The next prime is 1249518097. The reversal of 1249518055 is 5508159421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5508159421 = 191 ⋅28838531.

It is a de Polignac number, because none of the positive numbers 2^k-1249518055 is a prime.

It is a super-2 number, since 2×1249518055² = 3122590739541966050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) 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 a junction number, because it is equal to n+sod(n) for n = 1249517999 and 1249518017.

It is a congruent 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, 124951801 + ... + 124951810.

It is an arithmetic number, because the mean of its divisors is an integer number (374855418).

Almost surely, 2^1249518055 is an apocalyptic number.

1249518055 is a deficient number, since it is larger than the sum of its proper divisors (249903617).

1249518055 is an equidigital number, since it uses as much as digits as its factorization.

1249518055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249903616.

The product of its (nonzero) digits is 72000, while the sum is 40.

The square root of 1249518055 is about 35348.5226706860. The cubic root of 1249518055 is about 1077.0788846828.

The spelling of 1249518055 in words is "one billion, two hundred forty-nine million, five hundred eighteen thousand, fifty-five".