1681430731 has 8 divisors (see below), whose sum is σ = 1742880128. Its totient is φ = 1620432000.

The previous prime is 1681430693. The next prime is 1681430743. The reversal of 1681430731 is 1370341861.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1681430731 - 2¹³ = 1681422539 is a prime.

It is a super-2 number, since 2×1681430731² = 5654418606302388722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1681430771) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105060 + ... + 120001.

It is an arithmetic number, because the mean of its divisors is an integer number (217860016).

Almost surely, 2^1681430731 is an apocalyptic number.

1681430731 is a deficient number, since it is larger than the sum of its proper divisors (61449397).

1681430731 is a wasteful number, since it uses less digits than its factorization.

1681430731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225333.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 1681430731 is about 41005.2524806274. The cubic root of 1681430731 is about 1189.1217612043.

The spelling of 1681430731 in words is "one billion, six hundred eighty-one million, four hundred thirty thousand, seven hundred thirty-one".