1281625541 has 8 divisors (see below), whose sum is σ = 1465975104. Its totient is φ = 1097591040.

The previous prime is 1281625537. The next prime is 1281625577. The reversal of 1281625541 is 1455261821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1281625541 - 2² = 1281625537 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281625511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69980 + ... + 86373.

It is an arithmetic number, because the mean of its divisors is an integer number (183246888).

Almost surely, 2^1281625541 is an apocalyptic number.

It is an amenable number.

1281625541 is a deficient number, since it is larger than the sum of its proper divisors (184349563).

1281625541 is a wasteful number, since it uses less digits than its factorization.

1281625541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157531.

The product of its digits is 19200, while the sum is 35.

The square root of 1281625541 is about 35799.7980580897. The cubic root of 1281625541 is about 1086.2264769084.

The spelling of 1281625541 in words is "one billion, two hundred eighty-one million, six hundred twenty-five thousand, five hundred forty-one".