7456543121 has 4 divisors (see below), whose sum is σ = 7780740672. Its totient is φ = 7132345572.

The previous prime is 7456543117. The next prime is 7456543201. The reversal of 7456543121 is 1213456547.

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 7456543121 - 2² = 7456543117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7456543921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 162098741 + ... + 162098786.

It is an arithmetic number, because the mean of its divisors is an integer number (1945185168).

Almost surely, 2^7456543121 is an apocalyptic number.

It is an amenable number.

7456543121 is a deficient number, since it is larger than the sum of its proper divisors (324197551).

7456543121 is a wasteful number, since it uses less digits than its factorization.

7456543121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324197550.

The product of its digits is 100800, while the sum is 38.

The square root of 7456543121 is about 86351.2774717317. The cubic root of 7456543121 is about 1953.6458743807.

Adding to 7456543121 its reverse (1213456547), we get a palindrome (8669999668).

The spelling of 7456543121 in words is "seven billion, four hundred fifty-six million, five hundred forty-three thousand, one hundred twenty-one".