61239251 has 2 divisors, whose sum is σ = 61239252. Its totient is φ = 61239250.

The previous prime is 61239239. The next prime is 61239257. The reversal of 61239251 is 15293216.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61239251 - 2⁶ = 61239187 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61239257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30619625 + 30619626.

It is an arithmetic number, because the mean of its divisors is an integer number (30619626).

Almost surely, 2^61239251 is an apocalyptic number.

61239251 is a deficient number, since it is larger than the sum of its proper divisors (1).

61239251 is an equidigital number, since it uses as much as digits as its factorization.

61239251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3240, while the sum is 29.

The square root of 61239251 is about 7825.5511626977. The cubic root of 61239251 is about 394.1636976853.

The spelling of 61239251 in words is "sixty-one million, two hundred thirty-nine thousand, two hundred fifty-one".