1561254253 has 8 divisors (see below), whose sum is σ = 1681658496. Its totient is φ = 1440894000.

The previous prime is 1561254251. The next prime is 1561254259. The reversal of 1561254253 is 3524521651.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1561254253 - 2¹ = 1561254251 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 (1561254251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126048 + ... + 137878.

It is an arithmetic number, because the mean of its divisors is an integer number (210207312).

Almost surely, 2^1561254253 is an apocalyptic number.

1561254253 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1561254253 is a deficient number, since it is larger than the sum of its proper divisors (120404243).

1561254253 is a wasteful number, since it uses less digits than its factorization.

1561254253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21995.

The product of its digits is 36000, while the sum is 34.

The square root of 1561254253 is about 39512.7100184232. The cubic root of 1561254253 is about 1160.0887399908.

The spelling of 1561254253 in words is "one billion, five hundred sixty-one million, two hundred fifty-four thousand, two hundred fifty-three".