1121947469 has 2 divisors, whose sum is σ = 1121947470. Its totient is φ = 1121947468.

The previous prime is 1121947451. The next prime is 1121947483. The reversal of 1121947469 is 9647491211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1121245225 + 702244 = 33485^2 + 838^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1121947469 is a prime.

It is a super-2 number, since 2×1121947469² = 2517532246391011922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1121947369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560973734 + 560973735.

It is an arithmetic number, because the mean of its divisors is an integer number (560973735).

Almost surely, 2^1121947469 is an apocalyptic number.

It is an amenable number.

1121947469 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121947469 is an equidigital number, since it uses as much as digits as its factorization.

1121947469 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 44.

The square root of 1121947469 is about 33495.4843075899. The cubic root of 1121947469 is about 1039.1003897672.

The spelling of 1121947469 in words is "one billion, one hundred twenty-one million, nine hundred forty-seven thousand, four hundred sixty-nine".