61021111 has 2 divisors, whose sum is σ = 61021112. Its totient is φ = 61021110.

The previous prime is 61021099. The next prime is 61021127. The reversal of 61021111 is 11112016.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61021111 - 2¹⁹ = 60496823 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61021091 and 61021100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61021151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30510555 + 30510556.

It is an arithmetic number, because the mean of its divisors is an integer number (30510556).

Almost surely, 2^61021111 is an apocalyptic number.

61021111 is a deficient number, since it is larger than the sum of its proper divisors (1).

61021111 is an equidigital number, since it uses as much as digits as its factorization.

61021111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 13.

The square root of 61021111 is about 7811.6010522812. The cubic root of 61021111 is about 393.6951247621.

Adding to 61021111 its reverse (11112016), we get a palindrome (72133127).

The spelling of 61021111 in words is "sixty-one million, twenty-one thousand, one hundred eleven".