1561148475 has 24 divisors (see below), whose sum is σ = 2636021760. Its totient is φ = 814895520.

The previous prime is 1561148461. The next prime is 1561148507. The reversal of 1561148475 is 5748411651.

It is not a de Polignac number, because 1561148475 - 2¹³ = 1561140283 is a prime.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 217915 + ... + 224964.

It is an arithmetic number, because the mean of its divisors is an integer number (109834240).

Almost surely, 2^1561148475 is an apocalyptic number.

1561148475 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1561148475 is a deficient number, since it is larger than the sum of its proper divisors (1074873285).

1561148475 is a wasteful number, since it uses less digits than its factorization.

1561148475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442939 (or 442934 counting only the distinct ones).

The product of its digits is 134400, while the sum is 42.

The square root of 1561148475 is about 39511.3714644278. The cubic root of 1561148475 is about 1160.0625399793.

The spelling of 1561148475 in words is "one billion, five hundred sixty-one million, one hundred forty-eight thousand, four hundred seventy-five".