1561064435 has 16 divisors (see below), whose sum is σ = 2143010496. Its totient is φ = 1069383168.

The previous prime is 1561064431. The next prime is 1561064459. The reversal of 1561064435 is 5344601651.

It is not a de Polignac number, because 1561064435 - 2² = 1561064431 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1561064395 and 1561064404.

It is not an unprimeable number, because it can be changed into a prime (1561064431) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14567 + ... + 57743.

It is an arithmetic number, because the mean of its divisors is an integer number (133938156).

Almost surely, 2^1561064435 is an apocalyptic number.

1561064435 is a deficient number, since it is larger than the sum of its proper divisors (581946061).

1561064435 is a wasteful number, since it uses less digits than its factorization.

1561064435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44222.

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 1561064435 is about 39510.3079588099. The cubic root of 1561064435 is about 1160.0417233804.

The spelling of 1561064435 in words is "one billion, five hundred sixty-one million, sixty-four thousand, four hundred thirty-five".