1125777561 has 16 divisors (see below), whose sum is σ = 1514225664. Its totient is φ = 743949584.

The previous prime is 1125777559. The next prime is 1125777563. The reversal of 1125777561 is 1657775211.

It is an interprime number because it is at equal distance from previous prime (1125777559) and next prime (1125777563).

It is a cyclic number.

It is not a de Polignac number, because 1125777561 - 2¹ = 1125777559 is a prime.

It is a super-2 number, since 2×1125777561² = 2534750233702217442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1125777563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 188950 + ... + 194816.

It is an arithmetic number, because the mean of its divisors is an integer number (94639104).

Almost surely, 2^1125777561 is an apocalyptic number.

It is an amenable number.

1125777561 is a deficient number, since it is larger than the sum of its proper divisors (388448103).

1125777561 is a wasteful number, since it uses less digits than its factorization.

1125777561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6420.

The product of its digits is 102900, while the sum is 42.

The square root of 1125777561 is about 33552.6088553483. The cubic root of 1125777561 is about 1040.2814699811.

The spelling of 1125777561 in words is "one billion, one hundred twenty-five million, seven hundred seventy-seven thousand, five hundred sixty-one".