1378551009 has 16 divisors (see below), whose sum is σ = 2008716480. Its totient is φ = 834005760.

The previous prime is 1378551007. The next prime is 1378551043. The reversal of 1378551009 is 9001558731.

It is not a de Polignac number, because 1378551009 - 2¹ = 1378551007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1378551007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17932 + ... + 55485.

It is an arithmetic number, because the mean of its divisors is an integer number (125544780).

Almost surely, 2^1378551009 is an apocalyptic number.

It is an amenable number.

1378551009 is a deficient number, since it is larger than the sum of its proper divisors (630165471).

1378551009 is a wasteful number, since it uses less digits than its factorization.

1378551009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74000.

The product of its (nonzero) digits is 37800, while the sum is 39.

The square root of 1378551009 is about 37128.8433566143. The cubic root of 1378551009 is about 1112.9464797811.

The spelling of 1378551009 in words is "one billion, three hundred seventy-eight million, five hundred fifty-one thousand, nine".