1261655353 has 8 divisors (see below), whose sum is σ = 1491612480. Its totient is φ = 1044128400.

The previous prime is 1261655273. The next prime is 1261655387. The reversal of 1261655353 is 3535561621.

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

It is a de Polignac number, because none of the positive numbers 2^k-1261655353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1261655393) 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, 3107323 + ... + 3107728.

It is an arithmetic number, because the mean of its divisors is an integer number (186451560).

Almost surely, 2^1261655353 is an apocalyptic number.

It is an amenable number.

1261655353 is a deficient number, since it is larger than the sum of its proper divisors (229957127).

1261655353 is an equidigital number, since it uses as much as digits as its factorization.

1261655353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6215087.

The product of its digits is 81000, while the sum is 37.

The square root of 1261655353 is about 35519.7881891207. The cubic root of 1261655353 is about 1080.5550853113. Note that the first 3 decimals are identical.

The spelling of 1261655353 in words is "one billion, two hundred sixty-one million, six hundred fifty-five thousand, three hundred fifty-three".