1378551011 has 4 divisors (see below), whose sum is σ = 1381567992. Its totient is φ = 1375534032.

The previous prime is 1378551007. The next prime is 1378551043. The reversal of 1378551011 is 1101558731.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1378551011 - 2² = 1378551007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1378551211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1507805 + ... + 1508718.

It is an arithmetic number, because the mean of its divisors is an integer number (345391998).

Almost surely, 2^1378551011 is an apocalyptic number.

1378551011 is a deficient number, since it is larger than the sum of its proper divisors (3016981).

1378551011 is an equidigital number, since it uses as much as digits as its factorization.

1378551011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3016980.

The product of its (nonzero) digits is 4200, while the sum is 32.

The square root of 1378551011 is about 37128.8433835475. The cubic root of 1378551011 is about 1112.9464803193.

The spelling of 1378551011 in words is "one billion, three hundred seventy-eight million, five hundred fifty-one thousand, eleven".