61251251 has 2 divisors, whose sum is σ = 61251252. Its totient is φ = 61251250.

The previous prime is 61251247. The next prime is 61251287. The reversal of 61251251 is 15215216.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61251251 - 2² = 61251247 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (61251241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30625625 + 30625626.

It is an arithmetic number, because the mean of its divisors is an integer number (30625626).

Almost surely, 2^61251251 is an apocalyptic number.

61251251 is a deficient number, since it is larger than the sum of its proper divisors (1).

61251251 is an equidigital number, since it uses as much as digits as its factorization.

61251251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 600, while the sum is 23.

The square root of 61251251 is about 7826.3178442995. The cubic root of 61251251 is about 394.1894418248.

Adding to 61251251 its reverse (15215216), we get a palindrome (76466467).

The spelling of 61251251 in words is "sixty-one million, two hundred fifty-one thousand, two hundred fifty-one".