1561071801 has 32 divisors (see below), whose sum is σ = 2337493248. Its totient is φ = 921507840.

The previous prime is 1561071781. The next prime is 1561071821. The reversal of 1561071801 is 1081701651.

It is an interprime number because it is at equal distance from previous prime (1561071781) and next prime (1561071821).

It is not a de Polignac number, because 1561071801 - 2¹⁵ = 1561039033 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1561071821) 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 in 31 ways as a sum of consecutive naturals, for example, 60645 + ... + 82461.

It is an arithmetic number, because the mean of its divisors is an integer number (73046664).

Almost surely, 2^1561071801 is an apocalyptic number.

It is an amenable number.

1561071801 is a deficient number, since it is larger than the sum of its proper divisors (776421447).

1561071801 is a wasteful number, since it uses less digits than its factorization.

1561071801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21921.

The product of its (nonzero) digits is 1680, while the sum is 30.

The square root of 1561071801 is about 39510.4011748805. The cubic root of 1561071801 is about 1160.0435479589.

The spelling of 1561071801 in words is "one billion, five hundred sixty-one million, seventy-one thousand, eight hundred one".