1372646221 has 2 divisors, whose sum is σ = 1372646222. Its totient is φ = 1372646220.

The previous prime is 1372646207. The next prime is 1372646227. The reversal of 1372646221 is 1226462731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1358733321 + 13912900 = 36861^2 + 3730^2 .

It is a cyclic number.

It is not a de Polignac number, because 1372646221 - 2⁵ = 1372646189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1372646227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 686323110 + 686323111.

It is an arithmetic number, because the mean of its divisors is an integer number (686323111).

Almost surely, 2^1372646221 is an apocalyptic number.

It is an amenable number.

1372646221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1372646221 is an equidigital number, since it uses as much as digits as its factorization.

1372646221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 34.

The square root of 1372646221 is about 37049.2404915404. The cubic root of 1372646221 is about 1111.3551668000.

The spelling of 1372646221 in words is "one billion, three hundred seventy-two million, six hundred forty-six thousand, two hundred twenty-one".