7540121 has 4 divisors (see below), whose sum is σ = 7560192. Its totient is φ = 7520052.

The previous prime is 7540111. The next prime is 7540133. The reversal of 7540121 is 1210457.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1210457 = 31 ⋅39047.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7540121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7540093 and 7540102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7540111) 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, 9461 + ... + 10226.

It is an arithmetic number, because the mean of its divisors is an integer number (1890048).

Almost surely, 2^7540121 is an apocalyptic number.

It is an amenable number.

7540121 is a deficient number, since it is larger than the sum of its proper divisors (20071).

7540121 is a wasteful number, since it uses less digits than its factorization.

7540121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20070.

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 7540121 is about 2745.9280762613. The cubic root of 7540121 is about 196.0918024065.

Adding to 7540121 its reverse (1210457), we get a palindrome (8750578).

The spelling of 7540121 in words is "seven million, five hundred forty thousand, one hundred twenty-one".