125503811 has 2 divisors, whose sum is σ = 125503812. Its totient is φ = 125503810.

The previous prime is 125503757. The next prime is 125503817. The reversal of 125503811 is 118305521.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (118305521) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125503811 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (125503817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62751905 + 62751906.

It is an arithmetic number, because the mean of its divisors is an integer number (62751906).

Almost surely, 2^125503811 is an apocalyptic number.

125503811 is a deficient number, since it is larger than the sum of its proper divisors (1).

125503811 is an equidigital number, since it uses as much as digits as its factorization.

125503811 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1200, while the sum is 26.

The square root of 125503811 is about 11202.8483431670. The cubic root of 125503811 is about 500.6708475247.

It can be divided in two parts, 12550 and 3811, that added together give a palindrome (16361).

The spelling of 125503811 in words is "one hundred twenty-five million, five hundred three thousand, eight hundred eleven".