1684742551 has 6 divisors (see below), whose sum is σ = 1789674920. Its totient is φ = 1585639776.

The previous prime is 1684742539. The next prime is 1684742561. The reversal of 1684742551 is 1552474861.

It is not a de Polignac number, because 1684742551 - 2⁹ = 1684742039 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1684742498 and 1684742507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1684742561) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2914491 + ... + 2915068.

Almost surely, 2^1684742551 is an apocalyptic number.

1684742551 is a deficient number, since it is larger than the sum of its proper divisors (104932369).

1684742551 is an equidigital number, since it uses as much as digits as its factorization.

1684742551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5829593 (or 5829576 counting only the distinct ones).

The product of its digits is 268800, while the sum is 43.

The square root of 1684742551 is about 41045.6154905734. The cubic root of 1684742551 is about 1189.9019647129.

The spelling of 1684742551 in words is "one billion, six hundred eighty-four million, seven hundred forty-two thousand, five hundred fifty-one".