975729121 has 4 divisors (see below), whose sum is σ = 976676544. Its totient is φ = 974781700.

The previous prime is 975729119. The next prime is 975729133. The reversal of 975729121 is 121927579.

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 not a de Polignac number, because 975729121 - 2¹ = 975729119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (975729101) 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, 472165 + ... + 474226.

It is an arithmetic number, because the mean of its divisors is an integer number (244169136).

Almost surely, 2^975729121 is an apocalyptic number.

It is an amenable number.

975729121 is a deficient number, since it is larger than the sum of its proper divisors (947423).

975729121 is a wasteful number, since it uses less digits than its factorization.

975729121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 947422.

The product of its digits is 79380, while the sum is 43.

The square root of 975729121 is about 31236.6630900293. The cubic root of 975729121 is about 991.8433570654.

The spelling of 975729121 in words is "nine hundred seventy-five million, seven hundred twenty-nine thousand, one hundred twenty-one".