1125319977721 has 27 divisors (see below), whose sum is σ = 1163901952773. Its totient is φ = 1088010194040.

The previous prime is 1125319977709. The next prime is 1125319977739. The reversal of 1125319977721 is 1277799135211.

The square root of 1125319977721 is 1060811.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 1125319977721 - 2²¹ = 1125317880569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1125319977791) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 5046277816 + ... + 5046278038.

Almost surely, 2^{1125319977721} is an apocalyptic number.

1125319977721 is the 1060811-st square number.

1125319977721 is the 530406-th centered octagonal number.

It is an amenable number.

1125319977721 is a deficient number, since it is larger than the sum of its proper divisors (38581975052).

1125319977721 is an frugal number, since it uses more digits than its factorization.

1125319977721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 722 (or 361 counting only the distinct ones).

The product of its digits is 1666980, while the sum is 55.

The spelling of 1125319977721 in words is "one trillion, one hundred twenty-five billion, three hundred nineteen million, nine hundred seventy-seven thousand, seven hundred twenty-one".