1561146475 has 12 divisors (see below), whose sum is σ = 2212367824. Its totient is φ = 1070500320.

The previous prime is 1561146449. The next prime is 1561146479. The reversal of 1561146475 is 5746411651.

It is not a de Polignac number, because 1561146475 - 2¹³ = 1561138283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1561146479) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4460244 + ... + 4460593.

Almost surely, 2^1561146475 is an apocalyptic number.

1561146475 is a deficient number, since it is larger than the sum of its proper divisors (651221349).

1561146475 is an equidigital number, since it uses as much as digits as its factorization.

1561146475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8920854 (or 8920849 counting only the distinct ones).

The product of its digits is 100800, while the sum is 40.

The square root of 1561146475 is about 39511.3461552501. The cubic root of 1561146475 is about 1160.0620445906.

The spelling of 1561146475 in words is "one billion, five hundred sixty-one million, one hundred forty-six thousand, four hundred seventy-five".