1249348181 has 4 divisors (see below), whose sum is σ = 1249538892. Its totient is φ = 1249157472.

The previous prime is 1249348151. The next prime is 1249348231. The reversal of 1249348181 is 1818439421.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 89605156 + 1159743025 = 9466^2 + 34055^2 .

It is a cyclic number.

It is not a de Polignac number, because 1249348181 - 2¹⁰ = 1249347157 is a prime.

It is a super-2 number, since 2×1249348181² = 3121741754736017522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1249348151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85166 + ... + 98751.

It is an arithmetic number, because the mean of its divisors is an integer number (312384723).

Almost surely, 2^1249348181 is an apocalyptic number.

It is an amenable number.

1249348181 is a deficient number, since it is larger than the sum of its proper divisors (190711).

1249348181 is an equidigital number, since it uses as much as digits as its factorization.

1249348181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190710.

The product of its digits is 55296, while the sum is 41.

The square root of 1249348181 is about 35346.1197446056. The cubic root of 1249348181 is about 1077.0300722654.

The spelling of 1249348181 in words is "one billion, two hundred forty-nine million, three hundred forty-eight thousand, one hundred eighty-one".