3500981 has 4 divisors (see below), whose sum is σ = 3819264. Its totient is φ = 3182700.

The previous prime is 3500969. The next prime is 3500999. The reversal of 3500981 is 1890053.

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: 1890053 = 11 ⋅171823.

It is a cyclic number.

It is not a de Polignac number, because 3500981 - 2¹⁴ = 3484597 is a prime.

It is a super-2 number, since 2×3500981² = 24513735924722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3500981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3500941) 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, 159125 + ... + 159146.

It is an arithmetic number, because the mean of its divisors is an integer number (954816).

Almost surely, 2^3500981 is an apocalyptic number.

It is an amenable number.

3500981 is a deficient number, since it is larger than the sum of its proper divisors (318283).

3500981 is a wasteful number, since it uses less digits than its factorization.

3500981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318282.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 3500981 is about 1871.0908582963. The cubic root of 3500981 is about 151.8436324772.

The spelling of 3500981 in words is "three million, five hundred thousand, nine hundred eighty-one".