1561601307 has 32 divisors (see below), whose sum is σ = 2488762368. Its totient is φ = 851580576.

The previous prime is 1561601297. The next prime is 1561601329. The reversal of 1561601307 is 7031061651.

It is not a de Polignac number, because 1561601307 - 2⁴ = 1561601291 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1561601707) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 220138 + ... + 227120.

It is an arithmetic number, because the mean of its divisors is an integer number (77773824).

Almost surely, 2^1561601307 is an apocalyptic number.

1561601307 is a deficient number, since it is larger than the sum of its proper divisors (927161061).

1561601307 is a wasteful number, since it uses less digits than its factorization.

1561601307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7479.

The product of its (nonzero) digits is 3780, while the sum is 30.

The square root of 1561601307 is about 39517.1014498786. The cubic root of 1561601307 is about 1160.1746930225.

Adding to 1561601307 its reverse (7031061651), we get a palindrome (8592662958).

The spelling of 1561601307 in words is "one billion, five hundred sixty-one million, six hundred one thousand, three hundred seven".