1982551 has 2 divisors, whose sum is σ = 1982552. Its totient is φ = 1982550.

The previous prime is 1982537. The next prime is 1982567. The reversal of 1982551 is 1552891.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1982551 is a prime.

It is a Chen prime.

It is a plaindrome in base 11.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1982501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 991275 + 991276.

It is an arithmetic number, because the mean of its divisors is an integer number (991276).

2^1982551 is an apocalyptic number.

1982551 is a deficient number, since it is larger than the sum of its proper divisors (1).

1982551 is an equidigital number, since it uses as much as digits as its factorization.

1982551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3600, while the sum is 31.

The square root of 1982551 is about 1408.0308945474. The cubic root of 1982551 is about 125.6246281847.

The spelling of 1982551 in words is "one million, nine hundred eighty-two thousand, five hundred fifty-one".