7125551 has 4 divisors (see below), whose sum is σ = 7500600. Its totient is φ = 6750504.

The previous prime is 7125527. The next prime is 7125553. The reversal of 7125551 is 1555217.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1555217 = 463 ⋅3359.

It is a cyclic number.

It is not a de Polignac number, because 7125551 - 2¹⁰ = 7124527 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7125551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7125553) 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, 187496 + ... + 187533.

It is an arithmetic number, because the mean of its divisors is an integer number (1875150).

Almost surely, 2^7125551 is an apocalyptic number.

7125551 is a deficient number, since it is larger than the sum of its proper divisors (375049).

7125551 is a wasteful number, since it uses less digits than its factorization.

7125551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375048.

The product of its digits is 1750, while the sum is 26.

The square root of 7125551 is about 2669.3727727689. The cubic root of 7125551 is about 192.4300167263.

The spelling of 7125551 in words is "seven million, one hundred twenty-five thousand, five hundred fifty-one".