125561123 has 2 divisors, whose sum is σ = 125561124. Its totient is φ = 125561122.

The previous prime is 125561087. The next prime is 125561131. The reversal of 125561123 is 321165521.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 125561123 - 2¹⁴ = 125544739 is a prime.

It is a super-2 number, since 2×125561123² = 31531191218042258, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 125561092 and 125561101.

It is not a weakly prime, because it can be changed into another prime (125561143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62780561 + 62780562.

It is an arithmetic number, because the mean of its divisors is an integer number (62780562).

Almost surely, 2^125561123 is an apocalyptic number.

125561123 is a deficient number, since it is larger than the sum of its proper divisors (1).

125561123 is an equidigital number, since it uses as much as digits as its factorization.

125561123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1800, while the sum is 26.

The square root of 125561123 is about 11205.4059721190. The cubic root of 125561123 is about 500.7470472848.

The spelling of 125561123 in words is "one hundred twenty-five million, five hundred sixty-one thousand, one hundred twenty-three".