1255535641 has 4 divisors (see below), whose sum is σ = 1262472484. Its totient is φ = 1248598800.

The previous prime is 1255535621. The next prime is 1255535647. The reversal of 1255535641 is 1465355521.

It is a happy number.

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 103612041 + 1151923600 = 10179^2 + 33940^2 .

It is a cyclic number.

It is not a de Polignac number, because 1255535641 - 2²¹ = 1253438489 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1255535641.

It is not an unprimeable number, because it can be changed into a prime (1255535647) 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, 3468150 + ... + 3468511.

It is an arithmetic number, because the mean of its divisors is an integer number (315618121).

Almost surely, 2^1255535641 is an apocalyptic number.

It is an amenable number.

1255535641 is a deficient number, since it is larger than the sum of its proper divisors (6936843).

1255535641 is an equidigital number, since it uses as much as digits as its factorization.

1255535641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6936842.

The product of its digits is 90000, while the sum is 37.

The square root of 1255535641 is about 35433.5383640979. The cubic root of 1255535641 is about 1078.8051603642.

The spelling of 1255535641 in words is "one billion, two hundred fifty-five million, five hundred thirty-five thousand, six hundred forty-one".