615421061 has 2 divisors, whose sum is σ = 615421062. Its totient is φ = 615421060.

The previous prime is 615421057. The next prime is 615421123. The reversal of 615421061 is 160124516.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 383924836 + 231496225 = 19594^2 + 15215^2 .

It is a cyclic number.

It is not a de Polignac number, because 615421061 - 2² = 615421057 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 615421061.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (615421361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 307710530 + 307710531.

It is an arithmetic number, because the mean of its divisors is an integer number (307710531).

Almost surely, 2^615421061 is an apocalyptic number.

It is an amenable number.

615421061 is a deficient number, since it is larger than the sum of its proper divisors (1).

615421061 is an equidigital number, since it uses as much as digits as its factorization.

615421061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 615421061 is about 24807.6814918283. The cubic root of 615421061 is about 850.5975318679.

Adding to 615421061 its reverse (160124516), we get a palindrome (775545577).

The spelling of 615421061 in words is "six hundred fifteen million, four hundred twenty-one thousand, sixty-one".