1685404051 has 12 divisors (see below), whose sum is σ = 1774621240. Its totient is φ = 1600457760.

The previous prime is 1685404043. The next prime is 1685404093. The reversal of 1685404051 is 1504045861.

It is not a de Polignac number, because 1685404051 - 2³ = 1685404043 is a prime.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1685403998 and 1685404016.

It is not an unprimeable number, because it can be changed into a prime (1685404151) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62071 + ... + 84991.

Almost surely, 2^1685404051 is an apocalyptic number.

1685404051 is a deficient number, since it is larger than the sum of its proper divisors (89217189).

1685404051 is a wasteful number, since it uses less digits than its factorization.

1685404051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23106 (or 23083 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 34.

The square root of 1685404051 is about 41053.6728076795. The cubic root of 1685404051 is about 1190.0576793359.

The spelling of 1685404051 in words is "one billion, six hundred eighty-five million, four hundred four thousand, fifty-one".