125511401 has 2 divisors, whose sum is σ = 125511402. Its totient is φ = 125511400.

The previous prime is 125511389. The next prime is 125511403. The reversal of 125511401 is 104115521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121992025 + 3519376 = 11045^2 + 1876^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125511401 is a prime.

It is a super-2 number, since 2×125511401² = 31506223561965602, which contains 22 as substring.

Together with 125511403, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (125511403) 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, 62755700 + 62755701.

It is an arithmetic number, because the mean of its divisors is an integer number (62755701).

Almost surely, 2^125511401 is an apocalyptic number.

It is an amenable number.

125511401 is a deficient number, since it is larger than the sum of its proper divisors (1).

125511401 is an equidigital number, since it uses as much as digits as its factorization.

125511401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 200, while the sum is 20.

The square root of 125511401 is about 11203.1870911808. The cubic root of 125511401 is about 500.6809402198.

Adding to 125511401 its reverse (104115521), we get a palindrome (229626922).

The spelling of 125511401 in words is "one hundred twenty-five million, five hundred eleven thousand, four hundred one".