1278022601 has 2 divisors, whose sum is σ = 1278022602. Its totient is φ = 1278022600.

The previous prime is 1278022597. The next prime is 1278022633. The reversal of 1278022601 is 1062208721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 659256976 + 618765625 = 25676^2 + 24875^2 .

It is a cyclic number.

It is not a de Polignac number, because 1278022601 - 2² = 1278022597 is a prime.

It is not a weakly prime, because it can be changed into another prime (1278021601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639011300 + 639011301.

It is an arithmetic number, because the mean of its divisors is an integer number (639011301).

Almost surely, 2^1278022601 is an apocalyptic number.

It is an amenable number.

1278022601 is a deficient number, since it is larger than the sum of its proper divisors (1).

1278022601 is an equidigital number, since it uses as much as digits as its factorization.

1278022601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 1278022601 is about 35749.4419676727. The cubic root of 1278022601 is about 1085.2076452807.

The spelling of 1278022601 in words is "one billion, two hundred seventy-eight million, twenty-two thousand, six hundred one".