1275981641 has 8 divisors (see below), whose sum is σ = 1393049568. Its totient is φ = 1159092000.

The previous prime is 1275981611. The next prime is 1275981661. The reversal of 1275981641 is 1461895721.

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

It is not a de Polignac number, because 1275981641 - 2¹⁰ = 1275980617 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1275981592 and 1275981601.

It is not an unprimeable number, because it can be changed into a prime (1275981611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29375 + ... + 58436.

It is an arithmetic number, because the mean of its divisors is an integer number (174131196).

Almost surely, 2^1275981641 is an apocalyptic number.

1275981641 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1275981641 is a deficient number, since it is larger than the sum of its proper divisors (117067927).

1275981641 is a wasteful number, since it uses less digits than its factorization.

1275981641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89143.

The product of its digits is 120960, while the sum is 44.

The square root of 1275981641 is about 35720.8852213939. The cubic root of 1275981641 is about 1084.6296572066.

The spelling of 1275981641 in words is "one billion, two hundred seventy-five million, nine hundred eighty-one thousand, six hundred forty-one".