1681350401 has 4 divisors (see below), whose sum is σ = 1690743600. Its totient is φ = 1671957204.

The previous prime is 1681350383. The next prime is 1681350409. The reversal of 1681350401 is 1040531861.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1040531861 = 29 ⋅35880409.

It is a cyclic number.

It is not a de Polignac number, because 1681350401 - 2²⁶ = 1614241537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1681350409) 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, 4696331 + ... + 4696688.

It is an arithmetic number, because the mean of its divisors is an integer number (422685900).

Almost surely, 2^1681350401 is an apocalyptic number.

It is an amenable number.

1681350401 is a deficient number, since it is larger than the sum of its proper divisors (9393199).

1681350401 is an equidigital number, since it uses as much as digits as its factorization.

1681350401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9393198.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 1681350401 is about 41004.2729602660. The cubic root of 1681350401 is about 1189.1028242220.

The spelling of 1681350401 in words is "one billion, six hundred eighty-one million, three hundred fifty thousand, four hundred one".