1091545493 has 2 divisors, whose sum is σ = 1091545494. Its totient is φ = 1091545492.

The previous prime is 1091545457. The next prime is 1091545513. The reversal of 1091545493 is 3945451901.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 860718244 + 230827249 = 29338^2 + 15193^2 .

It is a cyclic number.

It is not a de Polignac number, because 1091545493 - 2⁸ = 1091545237 is a prime.

It is a super-2 number, since 2×1091545493² = 2382943126577226098, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1091545493.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1091565493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545772746 + 545772747.

It is an arithmetic number, because the mean of its divisors is an integer number (545772747).

Almost surely, 2^1091545493 is an apocalyptic number.

It is an amenable number.

1091545493 is a deficient number, since it is larger than the sum of its proper divisors (1).

1091545493 is an equidigital number, since it uses as much as digits as its factorization.

1091545493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 97200, while the sum is 41.

The square root of 1091545493 is about 33038.5455642345. The cubic root of 1091545493 is about 1029.6286382350.

The spelling of 1091545493 in words is "one billion, ninety-one million, five hundred forty-five thousand, four hundred ninety-three".