1226530691 has 2 divisors, whose sum is σ = 1226530692. Its totient is φ = 1226530690.

The previous prime is 1226530639. The next prime is 1226530741. The reversal of 1226530691 is 1960356221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1226530691 - 2²² = 1222336387 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1226530091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 613265345 + 613265346.

It is an arithmetic number, because the mean of its divisors is an integer number (613265346).

Almost surely, 2^1226530691 is an apocalyptic number.

1226530691 is a deficient number, since it is larger than the sum of its proper divisors (1).

1226530691 is an equidigital number, since it uses as much as digits as its factorization.

1226530691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 1226530691 is about 35021.8601876028. The cubic root of 1226530691 is about 1070.4329604301.

It can be divided in two parts, 1226530 and 691, that added together give a palindrome (1227221).

The spelling of 1226530691 in words is "one billion, two hundred twenty-six million, five hundred thirty thousand, six hundred ninety-one".