3507681981 has 8 divisors (see below), whose sum is σ = 4687012480. Its totient is φ = 2333403072.

The previous prime is 3507681967. The next prime is 3507681997. The reversal of 3507681981 is 1891867053.

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

It is not a de Polignac number, because 3507681981 - 2⁵ = 3507681949 is a prime.

It is a super-2 number, since 2×3507681981² = 24607665759664168722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 3507681981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3507681481) 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, 1261276 + ... + 1264053.

It is an arithmetic number, because the mean of its divisors is an integer number (585876560).

Almost surely, 2^3507681981 is an apocalyptic number.

It is an amenable number.

3507681981 is a deficient number, since it is larger than the sum of its proper divisors (1179330499).

3507681981 is a wasteful number, since it uses less digits than its factorization.

3507681981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2525795.

The product of its (nonzero) digits is 362880, while the sum is 48.

The square root of 3507681981 is about 59225.6868343458. The cubic root of 3507681981 is about 1519.4044846577.

The spelling of 3507681981 in words is "three billion, five hundred seven million, six hundred eighty-one thousand, nine hundred eighty-one".