1381248994 has 4 divisors (see below), whose sum is σ = 2071873494. Its totient is φ = 690624496.

The previous prime is 1381248971. The next prime is 1381249027. The reversal of 1381248994 is 4998421831.

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

It can be written as a sum of positive squares in only one way, i.e., 843612025 + 537636969 = 29045^2 + 23187^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345312247 + ... + 345312250.

Almost surely, 2^1381248994 is an apocalyptic number.

1381248994 is a deficient number, since it is larger than the sum of its proper divisors (690624500).

1381248994 is an equidigital number, since it uses as much as digits as its factorization.

1381248994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 690624499.

The product of its digits is 497664, while the sum is 49.

The square root of 1381248994 is about 37165.1583341172. The cubic root of 1381248994 is about 1113.6720619635.

The spelling of 1381248994 in words is "one billion, three hundred eighty-one million, two hundred forty-eight thousand, nine hundred ninety-four".