61215107 has 2 divisors, whose sum is σ = 61215108. Its totient is φ = 61215106.

The previous prime is 61215097. The next prime is 61215127. The reversal of 61215107 is 70151216.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61215107 - 2⁶ = 61215043 is a prime.

It is a super-3 number, since 3×61215107³ (a number of 24 digits) contains 333 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61215127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30607553 + 30607554.

It is an arithmetic number, because the mean of its divisors is an integer number (30607554).

Almost surely, 2^61215107 is an apocalyptic number.

61215107 is a deficient number, since it is larger than the sum of its proper divisors (1).

61215107 is an equidigital number, since it uses as much as digits as its factorization.

61215107 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 420, while the sum is 23.

The square root of 61215107 is about 7824.0083716724. The cubic root of 61215107 is about 394.1118902845. Note that the first 3 decimals are identical.

The spelling of 61215107 in words is "sixty-one million, two hundred fifteen thousand, one hundred seven".