61570121 has 2 divisors, whose sum is σ = 61570122. Its totient is φ = 61570120.

The previous prime is 61570097. The next prime is 61570169. The reversal of 61570121 is 12107516.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58369600 + 3200521 = 7640^2 + 1789^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61570121 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61570021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30785060 + 30785061.

It is an arithmetic number, because the mean of its divisors is an integer number (30785061).

Almost surely, 2^61570121 is an apocalyptic number.

It is an amenable number.

61570121 is a deficient number, since it is larger than the sum of its proper divisors (1).

61570121 is an equidigital number, since it uses as much as digits as its factorization.

61570121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 420, while the sum is 23.

The square root of 61570121 is about 7846.6630487106. The cubic root of 61570121 is about 394.8722996910.

Adding to 61570121 its reverse (12107516), we get a palindrome (73677637).

The spelling of 61570121 in words is "sixty-one million, five hundred seventy thousand, one hundred twenty-one".