1561016145 has 16 divisors (see below), whose sum is σ = 2689751232. Its totient is φ = 768500160.

The previous prime is 1561016131. The next prime is 1561016161. The reversal of 1561016145 is 5416101651.

It is not a de Polignac number, because 1561016145 - 2¹² = 1561012049 is a prime.

It is a super-2 number, since 2×1561016145² = 4873542809901322050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4002411 + ... + 4002800.

It is an arithmetic number, because the mean of its divisors is an integer number (168109452).

Almost surely, 2^1561016145 is an apocalyptic number.

1561016145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1561016145 is a deficient number, since it is larger than the sum of its proper divisors (1128735087).

1561016145 is a wasteful number, since it uses less digits than its factorization.

1561016145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8005232.

The product of its (nonzero) digits is 3600, while the sum is 30.

The square root of 1561016145 is about 39509.6968477360. The cubic root of 1561016145 is about 1160.0297616720.

Adding to 1561016145 its reverse (5416101651), we get a palindrome (6977117796).

The spelling of 1561016145 in words is "one billion, five hundred sixty-one million, sixteen thousand, one hundred forty-five".