1125121997 has 2 divisors, whose sum is σ = 1125121998. Its totient is φ = 1125121996.

The previous prime is 1125121957. The next prime is 1125122023. The reversal of 1125121997 is 7991215211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 844425481 + 280696516 = 29059^2 + 16754^2 .

It is a cyclic number.

It is not a de Polignac number, because 1125121997 - 2⁸ = 1125121741 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1125121997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1125121957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 562560998 + 562560999.

It is an arithmetic number, because the mean of its divisors is an integer number (562560999).

Almost surely, 2^1125121997 is an apocalyptic number.

It is an amenable number.

1125121997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1125121997 is an equidigital number, since it uses as much as digits as its factorization.

1125121997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11340, while the sum is 38.

The square root of 1125121997 is about 33542.8382370962. The cubic root of 1125121997 is about 1040.0795048317.

The spelling of 1125121997 in words is "one billion, one hundred twenty-five million, one hundred twenty-one thousand, nine hundred ninety-seven".