7491631621 has 8 divisors (see below), whose sum is σ = 7965509760. Its totient is φ = 7021441728.

The previous prime is 7491631607. The next prime is 7491631633. The reversal of 7491631621 is 1261361947.

7491631621 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 7491631621 - 2⁷ = 7491631493 is a prime.

It is a super-3 number, since 3×7491631621³ (a number of 31 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7491631601) 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, 917871 + ... + 925996.

It is an arithmetic number, because the mean of its divisors is an integer number (995688720).

Almost surely, 2^7491631621 is an apocalyptic number.

It is an amenable number.

7491631621 is a deficient number, since it is larger than the sum of its proper divisors (473878139).

7491631621 is a wasteful number, since it uses less digits than its factorization.

7491631621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1844123.

The product of its digits is 54432, while the sum is 40.

The square root of 7491631621 is about 86554.2120350015. The cubic root of 7491631621 is about 1956.7055252848.

The spelling of 7491631621 in words is "seven billion, four hundred ninety-one million, six hundred thirty-one thousand, six hundred twenty-one".