4491380961 has 32 divisors (see below), whose sum is σ = 6843035520. Its totient is φ = 2910203712.

The previous prime is 4491380947. The next prime is 4491380989. The reversal of 4491380961 is 1690831944.

It is not a de Polignac number, because 4491380961 - 2²¹ = 4489283809 is a prime.

It is a super-3 number, since 3×4491380961³ (a number of 30 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (4491380921) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 138451 + ... + 167783.

It is an arithmetic number, because the mean of its divisors is an integer number (213844860).

Almost surely, 2^4491380961 is an apocalyptic number.

It is an amenable number.

4491380961 is a deficient number, since it is larger than the sum of its proper divisors (2351654559).

4491380961 is a wasteful number, since it uses less digits than its factorization.

4491380961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29502 (or 29496 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 4491380961 is about 67017.7660102155. The cubic root of 4491380961 is about 1649.9088974493.

The spelling of 4491380961 in words is "four billion, four hundred ninety-one million, three hundred eighty thousand, nine hundred sixty-one".