1956551 has 4 divisors (see below), whose sum is σ = 1959600. Its totient is φ = 1953504.

The previous prime is 1956533. The next prime is 1956553. The reversal of 1956551 is 1556591.

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-1956551 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1956553) 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, 146 + ... + 1983.

It is an arithmetic number, because the mean of its divisors is an integer number (489900).

2^1956551 is an apocalyptic number.

1956551 is a deficient number, since it is larger than the sum of its proper divisors (3049).

1956551 is an equidigital number, since it uses as much as digits as its factorization.

1956551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3048.

The product of its digits is 6750, while the sum is 32.

The square root of 1956551 is about 1398.7676719170. The cubic root of 1956551 is about 125.0730453068.

The spelling of 1956551 in words is "one million, nine hundred fifty-six thousand, five hundred fifty-one".