1149571621 has 4 divisors (see below), whose sum is σ = 1254078144. Its totient is φ = 1045065100.

The previous prime is 1149571613. The next prime is 1149571627. The reversal of 1149571621 is 1261759411.

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.

It is a cyclic number.

It is not a de Polignac number, because 1149571621 - 2³ = 1149571613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1149571627) 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, 52253245 + ... + 52253266.

It is an arithmetic number, because the mean of its divisors is an integer number (313519536).

Almost surely, 2^1149571621 is an apocalyptic number.

1149571621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1149571621 is a deficient number, since it is larger than the sum of its proper divisors (104506523).

1149571621 is a wasteful number, since it uses less digits than its factorization.

1149571621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104506522.

The product of its digits is 15120, while the sum is 37.

The square root of 1149571621 is about 33905.3332235505. Note that the first 3 decimals coincide. The cubic root of 1149571621 is about 1047.5594476812.

The spelling of 1149571621 in words is "one billion, one hundred forty-nine million, five hundred seventy-one thousand, six hundred twenty-one".