1561601134 has 4 divisors (see below), whose sum is σ = 2342401704. Its totient is φ = 780800566.

The previous prime is 1561601131. The next prime is 1561601143. The reversal of 1561601134 is 4311061651.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561601131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390400282 + ... + 390400285.

It is an arithmetic number, because the mean of its divisors is an integer number (585600426).

Almost surely, 2^1561601134 is an apocalyptic number.

1561601134 is a deficient number, since it is larger than the sum of its proper divisors (780800570).

1561601134 is an equidigital number, since it uses as much as digits as its factorization.

1561601134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 780800569.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 1561601134 is about 39517.0992609528. The cubic root of 1561601134 is about 1160.1746501797.

Adding to 1561601134 its reverse (4311061651), we get a palindrome (5872662785).

The spelling of 1561601134 in words is "one billion, five hundred sixty-one million, six hundred one thousand, one hundred thirty-four".