7625512121 has 2 divisors, whose sum is σ = 7625512122. Its totient is φ = 7625512120.

The previous prime is 7625512057. The next prime is 7625512127. The reversal of 7625512121 is 1212155267.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6062179600 + 1563332521 = 77860^2 + 39539^2 .

It is a cyclic number.

It is not a de Polignac number, because 7625512121 - 2⁶ = 7625512057 is a prime.

It is not a weakly prime, because it can be changed into another prime (7625512127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3812756060 + 3812756061.

It is an arithmetic number, because the mean of its divisors is an integer number (3812756061).

Almost surely, 2^7625512121 is an apocalyptic number.

It is an amenable number.

7625512121 is a deficient number, since it is larger than the sum of its proper divisors (1).

7625512121 is an equidigital number, since it uses as much as digits as its factorization.

7625512121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8400, while the sum is 32.

The square root of 7625512121 is about 87324.1783299448. The cubic root of 7625512121 is about 1968.2926553269.

Adding to 7625512121 its reverse (1212155267), we get a palindrome (8837667388).

The spelling of 7625512121 in words is "seven billion, six hundred twenty-five million, five hundred twelve thousand, one hundred twenty-one".