1170021553 has 4 divisors (see below), whose sum is σ = 1170262080. Its totient is φ = 1169781028.

The previous prime is 1170021547. The next prime is 1170021557. The reversal of 1170021553 is 3551200711.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3551200711 = 53 ⋅67003787.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1170021553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1170021557) 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, 112813 + ... + 122746.

It is an arithmetic number, because the mean of its divisors is an integer number (292565520).

Almost surely, 2^1170021553 is an apocalyptic number.

It is an amenable number.

1170021553 is a deficient number, since it is larger than the sum of its proper divisors (240527).

1170021553 is an equidigital number, since it uses as much as digits as its factorization.

1170021553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240526.

The product of its (nonzero) digits is 1050, while the sum is 25.

The square root of 1170021553 is about 34205.5778053814. The cubic root of 1170021553 is about 1053.7347133616.

The spelling of 1170021553 in words is "one billion, one hundred seventy million, twenty-one thousand, five hundred fifty-three".