1553678261 has 8 divisors (see below), whose sum is σ = 1568793600. Its totient is φ = 1538578800.

The previous prime is 1553678257. The next prime is 1553678281. The reversal of 1553678261 is 1628763551.

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

It is a cyclic number.

It is not a de Polignac number, because 1553678261 - 2² = 1553678257 is a prime.

It is a super-2 number, since 2×1553678261² = 4827832277407968242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1553678281) 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, 311336 + ... + 316286.

It is an arithmetic number, because the mean of its divisors is an integer number (196099200).

Almost surely, 2^1553678261 is an apocalyptic number.

It is an amenable number.

1553678261 is a deficient number, since it is larger than the sum of its proper divisors (15115339).

1553678261 is a wasteful number, since it uses less digits than its factorization.

1553678261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7939.

The product of its digits is 302400, while the sum is 44.

The square root of 1553678261 is about 39416.7256504139. The cubic root of 1553678261 is about 1158.2092516720.

The spelling of 1553678261 in words is "one billion, five hundred fifty-three million, six hundred seventy-eight thousand, two hundred sixty-one".