61010101 has 2 divisors, whose sum is σ = 61010102. Its totient is φ = 61010100.

The previous prime is 61010069. The next prime is 61010111. The reversal of 61010101 is 10101016.

It is an a-pointer prime, because the next prime (61010111) can be obtained adding 61010101 to its sum of digits (10).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55487601 + 5522500 = 7449^2 + 2350^2 .

It is a cyclic number.

It is not a de Polignac number, because 61010101 - 2⁵ = 61010069 is a prime.

It is an alternating number because its digits alternate between even and odd.

61010101 is a modest number, since divided by 10101 gives 61 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61010111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30505050 + 30505051.

It is an arithmetic number, because the mean of its divisors is an integer number (30505051).

Almost surely, 2^61010101 is an apocalyptic number.

It is an amenable number.

61010101 is a deficient number, since it is larger than the sum of its proper divisors (1).

61010101 is an equidigital number, since it uses as much as digits as its factorization.

61010101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6, while the sum is 10.

The square root of 61010101 is about 7810.8962994012. The cubic root of 61010101 is about 393.6714452848.

Adding to 61010101 its reverse (10101016), we get a palindrome (71111117).

It can be divided in two parts, 6 and 1010101, that multiplied together give a palindrome (6060606).

The spelling of 61010101 in words is "sixty-one million, ten thousand, one hundred one".