1375978001 has 2 divisors, whose sum is σ = 1375978002. Its totient is φ = 1375978000.

The previous prime is 1375977961. The next prime is 1375978007. The reversal of 1375978001 is 1008795731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 772784401 + 603193600 = 27799^2 + 24560^2 .

It is a cyclic number.

It is not a de Polignac number, because 1375978001 - 2⁶ = 1375977937 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1375978001.

It is not a weakly prime, because it can be changed into another prime (1375978007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 687989000 + 687989001.

It is an arithmetic number, because the mean of its divisors is an integer number (687989001).

Almost surely, 2^1375978001 is an apocalyptic number.

It is an amenable number.

1375978001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1375978001 is an equidigital number, since it uses as much as digits as its factorization.

1375978001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52920, while the sum is 41.

The square root of 1375978001 is about 37094.1774541504. The cubic root of 1375978001 is about 1112.2536258022.

The spelling of 1375978001 in words is "one billion, three hundred seventy-five million, nine hundred seventy-eight thousand, one".