1255445551 has 4 divisors (see below), whose sum is σ = 1256252400. Its totient is φ = 1254638704.

The previous prime is 1255445537. The next prime is 1255445573. The reversal of 1255445551 is 1555445521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1555445521 = 7 ⋅222206503.

It is a cyclic number.

It is not a de Polignac number, because 1255445551 - 2¹¹ = 1255443503 is a prime.

It is a super-2 number, since 2×1255445551² = 3152287063051387202, which contains 22 as substring.

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 1255445551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1255445591) 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, 401086 + ... + 404203.

It is an arithmetic number, because the mean of its divisors is an integer number (314063100).

Almost surely, 2^1255445551 is an apocalyptic number.

1255445551 is a deficient number, since it is larger than the sum of its proper divisors (806849).

1255445551 is an equidigital number, since it uses as much as digits as its factorization.

1255445551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 806848.

The product of its digits is 100000, while the sum is 37.

The square root of 1255445551 is about 35432.2670880654. The cubic root of 1255445551 is about 1078.7793568006.

The spelling of 1255445551 in words is "one billion, two hundred fifty-five million, four hundred forty-five thousand, five hundred fifty-one".