3491563921 has 16 divisors (see below), whose sum is σ = 3867032448. Its totient is φ = 3135686400.

The previous prime is 3491563913. The next prime is 3491563927. The reversal of 3491563921 is 1293651943.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 3491563921 - 2³ = 3491563913 is a prime.

It is a super-2 number, since 2×3491563921² = 24382037228857788482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3491563927) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 154006 + ... + 175216.

It is an arithmetic number, because the mean of its divisors is an integer number (241689528).

Almost surely, 2^3491563921 is an apocalyptic number.

It is an amenable number.

3491563921 is a deficient number, since it is larger than the sum of its proper divisors (375468527).

3491563921 is a wasteful number, since it uses less digits than its factorization.

3491563921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21672.

The product of its digits is 174960, while the sum is 43.

The square root of 3491563921 is about 59089.4569360728. The cubic root of 3491563921 is about 1517.0736519565.

The spelling of 3491563921 in words is "three billion, four hundred ninety-one million, five hundred sixty-three thousand, nine hundred twenty-one".