681121516 has 6 divisors (see below), whose sum is σ = 1191962660. Its totient is φ = 340560756.

The previous prime is 681121459. The next prime is 681121549. The reversal of 681121516 is 615121186.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85140186 + ... + 85140193.

Almost surely, 2^681121516 is an apocalyptic number.

It is an amenable number.

681121516 is a deficient number, since it is larger than the sum of its proper divisors (510841144).

681121516 is a wasteful number, since it uses less digits than its factorization.

681121516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170280383 (or 170280381 counting only the distinct ones).

The product of its digits is 2880, while the sum is 31.

The square root of 681121516 is about 26098.3048491660. The cubic root of 681121516 is about 879.8491115262.

The spelling of 681121516 in words is "six hundred eighty-one million, one hundred twenty-one thousand, five hundred sixteen".