615481091 has 2 divisors, whose sum is σ = 615481092. Its totient is φ = 615481090.

The previous prime is 615481057. The next prime is 615481109. The reversal of 615481091 is 190184516.

Together with next prime (615481109) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-615481091 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (615481891) 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, 307740545 + 307740546.

It is an arithmetic number, because the mean of its divisors is an integer number (307740546).

Almost surely, 2^615481091 is an apocalyptic number.

615481091 is a deficient number, since it is larger than the sum of its proper divisors (1).

615481091 is an equidigital number, since it uses as much as digits as its factorization.

615481091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 35.

The square root of 615481091 is about 24808.8913698295. The cubic root of 615481091 is about 850.6251875727.

The spelling of 615481091 in words is "six hundred fifteen million, four hundred eighty-one thousand, ninety-one".