1242221593 has 2 divisors, whose sum is σ = 1242221594. Its totient is φ = 1242221592.

The previous prime is 1242221557. The next prime is 1242221597. The reversal of 1242221593 is 3951222421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 920090889 + 322130704 = 30333^2 + 17948^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242221593 - 2⁹ = 1242221081 is a prime.

It is a super-2 number, since 2×1242221593² = 3086228972230915298, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1242221597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621110796 + 621110797.

It is an arithmetic number, because the mean of its divisors is an integer number (621110797).

Almost surely, 2^1242221593 is an apocalyptic number.

It is an amenable number.

1242221593 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242221593 is an equidigital number, since it uses as much as digits as its factorization.

1242221593 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 31.

The square root of 1242221593 is about 35245.1641080021. The cubic root of 1242221593 is about 1074.9782849048.

The spelling of 1242221593 in words is "one billion, two hundred forty-two million, two hundred twenty-one thousand, five hundred ninety-three".