61512251 has 2 divisors, whose sum is σ = 61512252. Its totient is φ = 61512250.

The previous prime is 61512247. The next prime is 61512289. The reversal of 61512251 is 15221516.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61512251 - 2² = 61512247 is a prime.

It is not a weakly prime, because it can be changed into another prime (61512211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30756125 + 30756126.

It is an arithmetic number, because the mean of its divisors is an integer number (30756126).

Almost surely, 2^61512251 is an apocalyptic number.

61512251 is a deficient number, since it is larger than the sum of its proper divisors (1).

61512251 is an equidigital number, since it uses as much as digits as its factorization.

61512251 is an odious number, because the sum of its binary digits is odd.

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

The square root of 61512251 is about 7842.9746270149. The cubic root of 61512251 is about 394.7485468994.

Adding to 61512251 its reverse (15221516), we get a palindrome (76733767).

The spelling of 61512251 in words is "sixty-one million, five hundred twelve thousand, two hundred fifty-one".