125622821 has 2 divisors, whose sum is σ = 125622822. Its totient is φ = 125622820.

The previous prime is 125622799. The next prime is 125622901. The reversal of 125622821 is 128226521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122965921 + 2656900 = 11089^2 + 1630^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125622821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125622121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62811410 + 62811411.

It is an arithmetic number, because the mean of its divisors is an integer number (62811411).

Almost surely, 2^125622821 is an apocalyptic number.

It is an amenable number.

125622821 is a deficient number, since it is larger than the sum of its proper divisors (1).

125622821 is an equidigital number, since it uses as much as digits as its factorization.

125622821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3840, while the sum is 29.

The square root of 125622821 is about 11208.1586801758. The cubic root of 125622821 is about 500.8290525839.

The spelling of 125622821 in words is "one hundred twenty-five million, six hundred twenty-two thousand, eight hundred twenty-one".