747514138921 has 27 divisors (see below), whose sum is σ = 838008142167. Its totient is φ = 666286866960.

The previous prime is 747514138907. The next prime is 747514138933. The reversal of 747514138921 is 129831415747.

The square root of 747514138921 is 864589.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 538880787225 + 208633351696 = 734085^2 + 456764^2 .

It is not a de Polignac number, because 747514138921 - 2⁹ = 747514138409 is a prime.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (747514138991) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 504054646 + ... + 504056128.

Almost surely, 2^747514138921 is an apocalyptic number.

747514138921 is the 864589-th square number.

747514138921 is the 432295-th centered octagonal number.

It is an amenable number.

747514138921 is a deficient number, since it is larger than the sum of its proper divisors (90494003246).

747514138921 is an frugal number, since it uses more digits than its factorization.

747514138921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3094 (or 1547 counting only the distinct ones).

The product of its digits is 1693440, while the sum is 52.

The spelling of 747514138921 in words is "seven hundred forty-seven billion, five hundred fourteen million, one hundred thirty-eight thousand, nine hundred twenty-one".