61020251 has 4 divisors (see below), whose sum is σ = 61086312. Its totient is φ = 60954192.

The previous prime is 61020247. The next prime is 61020283. The reversal of 61020251 is 15202016.

61020251 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61020251 - 2² = 61020247 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61020221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31625 + ... + 33498.

It is an arithmetic number, because the mean of its divisors is an integer number (15271578).

Almost surely, 2^61020251 is an apocalyptic number.

61020251 is a deficient number, since it is larger than the sum of its proper divisors (66061).

61020251 is an equidigital number, since it uses as much as digits as its factorization.

61020251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66060.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 61020251 is about 7811.5460057533. The cubic root of 61020251 is about 393.6932752416.

Adding to 61020251 its reverse (15202016), we get a palindrome (76222267).

The spelling of 61020251 in words is "sixty-one million, twenty thousand, two hundred fifty-one".