1550661115 has 4 divisors (see below), whose sum is σ = 1860793344. Its totient is φ = 1240528888.

The previous prime is 1550661097. The next prime is 1550661131. The reversal of 1550661115 is 5111660551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5111660551 = 1583 ⋅3229097.

It is a cyclic number.

It is not a de Polignac number, because 1550661115 - 2⁹ = 1550660603 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155066107 + ... + 155066116.

It is an arithmetic number, because the mean of its divisors is an integer number (465198336).

Almost surely, 2^1550661115 is an apocalyptic number.

1550661115 is a deficient number, since it is larger than the sum of its proper divisors (310132229).

1550661115 is an equidigital number, since it uses as much as digits as its factorization.

1550661115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310132228.

The product of its (nonzero) digits is 4500, while the sum is 31.

The square root of 1550661115 is about 39378.4346438504. The cubic root of 1550661115 is about 1157.4590425357.

The spelling of 1550661115 in words is "one billion, five hundred fifty million, six hundred sixty-one thousand, one hundred fifteen".