615420889 has 4 divisors (see below), whose sum is σ = 632053924. Its totient is φ = 598787856.

The previous prime is 615420877. The next prime is 615420901. The reversal of 615420889 is 988024516.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (615420877) and next prime (615420901).

It can be written as a sum of positive squares in 2 ways, for example, as 271689289 + 343731600 = 16483^2 + 18540^2 .

It is a cyclic number.

It is not a de Polignac number, because 615420889 - 2⁵ = 615420857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (615427889) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8316462 + ... + 8316535.

It is an arithmetic number, because the mean of its divisors is an integer number (158013481).

Almost surely, 2^615420889 is an apocalyptic number.

It is an amenable number.

615420889 is a deficient number, since it is larger than the sum of its proper divisors (16633035).

615420889 is a wasteful number, since it uses less digits than its factorization.

615420889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16633034.

The product of its (nonzero) digits is 138240, while the sum is 43.

The square root of 615420889 is about 24807.6780251599. The cubic root of 615420889 is about 850.5974526252.

The spelling of 615420889 in words is "six hundred fifteen million, four hundred twenty thousand, eight hundred eighty-nine".