61201125521 has 2 divisors, whose sum is σ = 61201125522. Its totient is φ = 61201125520.

The previous prime is 61201125481. The next prime is 61201125547. The reversal of 61201125521 is 12552110216.

It is an a-pointer prime, because the next prime (61201125547) can be obtained adding 61201125521 to its sum of digits (26).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50967577600 + 10233547921 = 225760^2 + 101161^2 .

It is a cyclic number.

It is not a de Polignac number, because 61201125521 - 2²² = 61196931217 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (61201125221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30600562760 + 30600562761.

It is an arithmetic number, because the mean of its divisors is an integer number (30600562761).

Almost surely, 2^61201125521 is an apocalyptic number.

It is an amenable number.

61201125521 is a deficient number, since it is larger than the sum of its proper divisors (1).

61201125521 is an equidigital number, since it uses as much as digits as its factorization.

61201125521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1200, while the sum is 26.

Adding to 61201125521 its reverse (12552110216), we get a palindrome (73753235737).

The spelling of 61201125521 in words is "sixty-one billion, two hundred one million, one hundred twenty-five thousand, five hundred twenty-one".