1255500551 has 4 divisors (see below), whose sum is σ = 1257076632. Its totient is φ = 1253924472.

The previous prime is 1255500497. The next prime is 1255500553. The reversal of 1255500551 is 1550055521.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1255500551 is a prime.

It is a super-2 number, since 2×1255500551² = 3152563267122607202, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1255500553) 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, 786845 + ... + 788438.

It is an arithmetic number, because the mean of its divisors is an integer number (314269158).

Almost surely, 2^1255500551 is an apocalyptic number.

1255500551 is a deficient number, since it is larger than the sum of its proper divisors (1576081).

1255500551 is an equidigital number, since it uses as much as digits as its factorization.

1255500551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1576080.

The product of its (nonzero) digits is 6250, while the sum is 29.

The square root of 1255500551 is about 35433.0432082823. The cubic root of 1255500551 is about 1078.7951100387.

The spelling of 1255500551 in words is "one billion, two hundred fifty-five million, five hundred thousand, five hundred fifty-one".