681445262 has 4 divisors (see below), whose sum is σ = 1022167896. Its totient is φ = 340722630.

The previous prime is 681445201. The next prime is 681445307. The reversal of 681445262 is 262544186.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 262544186 = 2 ⋅131272093.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170361314 + ... + 170361317.

It is an arithmetic number, because the mean of its divisors is an integer number (255541974).

Almost surely, 2^681445262 is an apocalyptic number.

681445262 is a deficient number, since it is larger than the sum of its proper divisors (340722634).

681445262 is a wasteful number, since it uses less digits than its factorization.

681445262 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340722633.

The product of its digits is 92160, while the sum is 38.

The square root of 681445262 is about 26104.5065458055. The cubic root of 681445262 is about 879.9884907241.

The spelling of 681445262 in words is "six hundred eighty-one million, four hundred forty-five thousand, two hundred sixty-two".