125104781 has 4 divisors (see below), whose sum is σ = 125402364. Its totient is φ = 124807200.

The previous prime is 125104757. The next prime is 125104783. The reversal of 125104781 is 187401521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 187401521 = 419 ⋅447259.

It can be written as a sum of positive squares in 2 ways, for example, as 58828900 + 66275881 = 7670^2 + 8141^2 .

It is a cyclic number.

It is not a de Polignac number, because 125104781 - 2¹⁰ = 125103757 is a prime.

It is a super-2 number, since 2×125104781² = 31302412458115922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125104783) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 148160 + ... + 149001.

It is an arithmetic number, because the mean of its divisors is an integer number (31350591).

Almost surely, 2^125104781 is an apocalyptic number.

It is an amenable number.

125104781 is a deficient number, since it is larger than the sum of its proper divisors (297583).

125104781 is an equidigital number, since it uses as much as digits as its factorization.

125104781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297582.

The product of its (nonzero) digits is 2240, while the sum is 29.

The square root of 125104781 is about 11185.0248546885. The cubic root of 125104781 is about 500.1396689815.

The spelling of 125104781 in words is "one hundred twenty-five million, one hundred four thousand, seven hundred eighty-one".