1378197651 has 16 divisors (see below), whose sum is σ = 1918480896. Its totient is φ = 878397696.

The previous prime is 1378197647. The next prime is 1378197677. The reversal of 1378197651 is 1567918731.

It is not a de Polignac number, because 1378197651 - 2² = 1378197647 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1378197651.

It is not an unprimeable number, because it can be changed into a prime (1378197451) 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, 175066 + ... + 182768.

It is an arithmetic number, because the mean of its divisors is an integer number (119905056).

Almost surely, 2^1378197651 is an apocalyptic number.

1378197651 is a deficient number, since it is larger than the sum of its proper divisors (540283245).

1378197651 is a wasteful number, since it uses less digits than its factorization.

1378197651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10322.

The product of its digits is 317520, while the sum is 48.

The square root of 1378197651 is about 37124.0845139648. The cubic root of 1378197651 is about 1112.8513794073.

The spelling of 1378197651 in words is "one billion, three hundred seventy-eight million, one hundred ninety-seven thousand, six hundred fifty-one".