1561383045 has 48 divisors (see below), whose sum is σ = 2940787200. Its totient is φ = 763447680.

The previous prime is 1561383041. The next prime is 1561383049. The reversal of 1561383045 is 5403831651.

1561383045 is a `hidden beast` number, since 1 + 5 + 613 + 8 + 30 + 4 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (1561383041) and next prime (1561383049).

It is not a de Polignac number, because 1561383045 - 2² = 1561383041 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561383041) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2950 + ... + 55959.

It is an arithmetic number, because the mean of its divisors is an integer number (61266400).

Almost surely, 2^1561383045 is an apocalyptic number.

1561383045 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1561383045 is a deficient number, since it is larger than the sum of its proper divisors (1379404155).

1561383045 is a wasteful number, since it uses less digits than its factorization.

1561383045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58970 (or 58967 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 1561383045 is about 39514.3397388847. The cubic root of 1561383045 is about 1160.1206387117.

The spelling of 1561383045 in words is "one billion, five hundred sixty-one million, three hundred eighty-three thousand, forty-five".