125511481 has 2 divisors, whose sum is σ = 125511482. Its totient is φ = 125511480.

The previous prime is 125511443. The next prime is 125511497. The reversal of 125511481 is 184115521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 123565456 + 1946025 = 11116^2 + 1395^2 .

It is an emirp because it is prime and its reverse (184115521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 125511481 - 2¹³ = 125503289 is a prime.

It is a super-2 number, since 2×125511481² = 31506263725626722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (125511401) 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, 62755740 + 62755741.

It is an arithmetic number, because the mean of its divisors is an integer number (62755741).

Almost surely, 2^125511481 is an apocalyptic number.

It is an amenable number.

125511481 is a deficient number, since it is larger than the sum of its proper divisors (1).

125511481 is an equidigital number, since it uses as much as digits as its factorization.

125511481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1600, while the sum is 28.

The square root of 125511481 is about 11203.1906615928. The cubic root of 125511481 is about 500.6810465966.

The spelling of 125511481 in words is "one hundred twenty-five million, five hundred eleven thousand, four hundred eighty-one".