7431641081 has 4 divisors (see below), whose sum is σ = 7589761152. Its totient is φ = 7273521012.

The previous prime is 7431641059. The next prime is 7431641083. The reversal of 7431641081 is 1801461347.

It is a happy number.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7431641081 is a prime.

It is a super-2 number, since 2×7431641081² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7431641083) 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, 79059965 + ... + 79060058.

It is an arithmetic number, because the mean of its divisors is an integer number (1897440288).

Almost surely, 2^7431641081 is an apocalyptic number.

It is an amenable number.

7431641081 is a deficient number, since it is larger than the sum of its proper divisors (158120071).

7431641081 is a wasteful number, since it uses less digits than its factorization.

7431641081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158120070.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 7431641081 is about 86206.9665456337. The cubic root of 7431641081 is about 1951.4686355489.

The spelling of 7431641081 in words is "seven billion, four hundred thirty-one million, six hundred forty-one thousand, eighty-one".