1561550151 has 8 divisors (see below), whose sum is σ = 2379505024. Its totient is φ = 892314360.

The previous prime is 1561550071. The next prime is 1561550161. The reversal of 1561550151 is 1510551651.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1561550151 - 2²⁵ = 1527995719 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561550161) 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 in 7 ways as a sum of consecutive naturals, for example, 37179745 + ... + 37179786.

It is an arithmetic number, because the mean of its divisors is an integer number (297438128).

Almost surely, 2^1561550151 is an apocalyptic number.

1561550151 is a deficient number, since it is larger than the sum of its proper divisors (817954873).

1561550151 is an equidigital number, since it uses as much as digits as its factorization.

1561550151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74359541.

The product of its (nonzero) digits is 3750, while the sum is 30.

The square root of 1561550151 is about 39516.4541805056. The cubic root of 1561550151 is about 1160.1620242864.

The spelling of 1561550151 in words is "one billion, five hundred sixty-one million, five hundred fifty thousand, one hundred fifty-one".