1225545577 has 2 divisors, whose sum is σ = 1225545578. Its totient is φ = 1225545576.

The previous prime is 1225545569. The next prime is 1225545613. The reversal of 1225545577 is 7755455221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 826505001 + 399040576 = 28749^2 + 19976^2 .

It is a cyclic number.

It is not a de Polignac number, because 1225545577 - 2³ = 1225545569 is a prime.

It is a super-2 number, since 2×1225545577² = 3003923922608525858, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1225545557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612772788 + 612772789.

It is an arithmetic number, because the mean of its divisors is an integer number (612772789).

Almost surely, 2^1225545577 is an apocalyptic number.

It is an amenable number.

1225545577 is a deficient number, since it is larger than the sum of its proper divisors (1).

1225545577 is an equidigital number, since it uses as much as digits as its factorization.

1225545577 is an evil number, because the sum of its binary digits is even.

The product of its digits is 490000, while the sum is 43.

The square root of 1225545577 is about 35007.7930895394. The cubic root of 1225545577 is about 1070.1463034000.

The spelling of 1225545577 in words is "one billion, two hundred twenty-five million, five hundred forty-five thousand, five hundred seventy-seven".