2550991 has 2 divisors, whose sum is σ = 2550992. Its totient is φ = 2550990.

The previous prime is 2550973. The next prime is 2551009. The reversal of 2550991 is 1990552.

It is a balanced prime because it is at equal distance from previous prime (2550973) and next prime (2551009).

It is a cyclic number.

It is not a de Polignac number, because 2550991 - 2⁹ = 2550479 is a prime.

It is a super-3 number, since 3×2550991³ = 49802143339178676813, which contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2550941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1275495 + 1275496.

It is an arithmetic number, because the mean of its divisors is an integer number (1275496).

2^2550991 is an apocalyptic number.

2550991 is a deficient number, since it is larger than the sum of its proper divisors (1).

2550991 is an equidigital number, since it uses as much as digits as its factorization.

2550991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4050, while the sum is 31.

The square root of 2550991 is about 1597.1822062620. The cubic root of 2550991 is about 136.6374165705.

It can be divided in two parts, 25509 and 91, that added together give a square (25600 = 160²).

The spelling of 2550991 in words is "two million, five hundred fifty thousand, nine hundred ninety-one".