1255355761 has 9 divisors (see below), whose sum is σ = 1380282379. Its totient is φ = 1140878200.

The previous prime is 1255355749. The next prime is 1255355767. The reversal of 1255355761 is 1675535521.

The square root of 1255355761 is 35431.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 968392161 + 286963600 = 31119^2 + 16940^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1255355761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1255355767) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 388131 + ... + 391351.

Almost surely, 2^1255355761 is an apocalyptic number.

1255355761 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1255355761 is the 35431-st square number.

1255355761 is the 17716-th centered octagonal number.

It is an amenable number.

1255355761 is a deficient number, since it is larger than the sum of its proper divisors (124926618).

1255355761 is an frugal number, since it uses more digits than its factorization.

1255355761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6464 (or 3232 counting only the distinct ones).

The product of its digits is 157500, while the sum is 40.

The cubic root of 1255355761 is about 1078.7536379345.

The spelling of 1255355761 in words is "one billion, two hundred fifty-five million, three hundred fifty-five thousand, seven hundred sixty-one".