125148054821 has 4 divisors (see below), whose sum is σ = 128200446444. Its totient is φ = 122095663200.

The previous prime is 125148054817. The next prime is 125148054827. The reversal of 125148054821 is 128450841521.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7352205025 + 117795849796 = 85745^2 + 343214^2 .

It is a cyclic number.

It is not a de Polignac number, because 125148054821 - 2² = 125148054817 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41), and also a Moran number because the ratio is a prime number: 3052391581 = 125148054821 / (1 + 2 + 5 + 1 + 4 + 8 + 0 + 5 + 4 + 8 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125148054827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1526195750 + ... + 1526195831.

It is an arithmetic number, because the mean of its divisors is an integer number (32050111611).

Almost surely, 2^125148054821 is an apocalyptic number.

It is an amenable number.

125148054821 is a deficient number, since it is larger than the sum of its proper divisors (3052391623).

125148054821 is an equidigital number, since it uses as much as digits as its factorization.

125148054821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3052391622.

The product of its (nonzero) digits is 102400, while the sum is 41.

The spelling of 125148054821 in words is "one hundred twenty-five billion, one hundred forty-eight million, fifty-four thousand, eight hundred twenty-one".