125381281 has 4 divisors (see below), whose sum is σ = 125453232. Its totient is φ = 125309332.

The previous prime is 125381233. The next prime is 125381287. The reversal of 125381281 is 182183521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 125381281 - 2²¹ = 123284129 is a prime.

It is a super-2 number, since 2×125381281² = 31440931250401922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125381287) 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, 33295 + ... + 36868.

It is an arithmetic number, because the mean of its divisors is an integer number (31363308).

Almost surely, 2^125381281 is an apocalyptic number.

It is an amenable number.

125381281 is a deficient number, since it is larger than the sum of its proper divisors (71951).

125381281 is an equidigital number, since it uses as much as digits as its factorization.

125381281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71950.

The product of its digits is 3840, while the sum is 31.

The square root of 125381281 is about 11197.3783092294. The cubic root of 125381281 is about 500.5078586512.

The spelling of 125381281 in words is "one hundred twenty-five million, three hundred eighty-one thousand, two hundred eighty-one".