1255550691 has 16 divisors (see below), whose sum is σ = 1779300864. Its totient is φ = 784792704.

The previous prime is 1255550689. The next prime is 1255550693. The reversal of 1255550691 is 1960555521.

It is an interprime number because it is at equal distance from previous prime (1255550689) and next prime (1255550693).

It is not a de Polignac number, because 1255550691 - 2¹ = 1255550689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1255550693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33391 + ... + 60216.

It is an arithmetic number, because the mean of its divisors is an integer number (111206304).

Almost surely, 2^1255550691 is an apocalyptic number.

1255550691 is a deficient number, since it is larger than the sum of its proper divisors (523750173).

1255550691 is a wasteful number, since it uses less digits than its factorization.

1255550691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93890.

The product of its (nonzero) digits is 67500, while the sum is 39.

The square root of 1255550691 is about 35433.7507328818. The cubic root of 1255550691 is about 1078.8094708625.

The spelling of 1255550691 in words is "one billion, two hundred fifty-five million, five hundred fifty thousand, six hundred ninety-one".