1561275703 has 4 divisors (see below), whose sum is σ = 1681373848. Its totient is φ = 1441177560.

The previous prime is 1561275671. The next prime is 1561275787. The reversal of 1561275703 is 3075721651.

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

It is a cyclic number.

It is not a de Polignac number, because 1561275703 - 2⁵ = 1561275671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561285703) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60049053 + ... + 60049078.

It is an arithmetic number, because the mean of its divisors is an integer number (420343462).

Almost surely, 2^1561275703 is an apocalyptic number.

1561275703 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1561275703 is a deficient number, since it is larger than the sum of its proper divisors (120098145).

1561275703 is a wasteful number, since it uses less digits than its factorization.

1561275703 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120098144.

The product of its (nonzero) digits is 44100, while the sum is 37.

The square root of 1561275703 is about 39512.9814491390. The cubic root of 1561275703 is about 1160.0940527684.

The spelling of 1561275703 in words is "one billion, five hundred sixty-one million, two hundred seventy-five thousand, seven hundred three".