1121513621 has 2 divisors, whose sum is σ = 1121513622. Its totient is φ = 1121513620.

The previous prime is 1121513599. The next prime is 1121513633. The reversal of 1121513621 is 1263151211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 723072100 + 398441521 = 26890^2 + 19961^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121513621 - 2¹⁰ = 1121512597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1121513641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560756810 + 560756811.

It is an arithmetic number, because the mean of its divisors is an integer number (560756811).

Almost surely, 2^1121513621 is an apocalyptic number.

It is an amenable number.

1121513621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121513621 is an equidigital number, since it uses as much as digits as its factorization.

1121513621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 360, while the sum is 23.

The square root of 1121513621 is about 33489.0074651370. The cubic root of 1121513621 is about 1038.9664352642.

Adding to 1121513621 its reverse (1263151211), we get a palindrome (2384664832).

The spelling of 1121513621 in words is "one billion, one hundred twenty-one million, five hundred thirteen thousand, six hundred twenty-one".