747138641491 has 8 divisors (see below), whose sum is σ = 815066977968. Its totient is φ = 679211412000.

The previous prime is 747138641477. The next prime is 747138641521. The reversal of 747138641491 is 194146831747.

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

It is not a de Polignac number, because 747138641491 - 2¹⁹ = 747138117203 is a prime.

It is a super-2 number, since 2×747138641491² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (747138611491) 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, 1835361 + ... + 2205181.

It is an arithmetic number, because the mean of its divisors is an integer number (101883372246).

Almost surely, 2^747138641491 is an apocalyptic number.

747138641491 is a deficient number, since it is larger than the sum of its proper divisors (67928336477).

747138641491 is a wasteful number, since it uses less digits than its factorization.

747138641491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 553493.

The product of its digits is 4064256, while the sum is 55.

The spelling of 747138641491 in words is "seven hundred forty-seven billion, one hundred thirty-eight million, six hundred forty-one thousand, four hundred ninety-one".