1681419977 has 4 divisors (see below), whose sum is σ = 1694255376. Its totient is φ = 1668584580.

The previous prime is 1681419973. The next prime is 1681419979. The reversal of 1681419977 is 7799141861.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1681419977 - 2² = 1681419973 is a prime.

It is a super-3 number, since 3×1681419977³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1681419973) 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, 6417503 + ... + 6417764.

It is an arithmetic number, because the mean of its divisors is an integer number (423563844).

Almost surely, 2^1681419977 is an apocalyptic number.

It is an amenable number.

1681419977 is a deficient number, since it is larger than the sum of its proper divisors (12835399).

1681419977 is a wasteful number, since it uses less digits than its factorization.

1681419977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12835398.

The product of its digits is 762048, while the sum is 53.

The square root of 1681419977 is about 41005.1213508752. The cubic root of 1681419977 is about 1189.1192260929.

The spelling of 1681419977 in words is "one billion, six hundred eighty-one million, four hundred nineteen thousand, nine hundred seventy-seven".