1621008249 has 24 divisors (see below), whose sum is σ = 2532600288. Its totient is φ = 919517760.

The previous prime is 1621008247. The next prime is 1621008269. The reversal of 1621008249 is 9428001261.

It is not a de Polignac number, because 1621008249 - 2¹ = 1621008247 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1621008241) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20107 + ... + 60384.

It is an arithmetic number, because the mean of its divisors is an integer number (105525012).

Almost surely, 2^1621008249 is an apocalyptic number.

It is an amenable number.

1621008249 is a deficient number, since it is larger than the sum of its proper divisors (911592039).

1621008249 is a wasteful number, since it uses less digits than its factorization.

1621008249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80645 (or 80638 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 1621008249 is about 40261.7467206777. The cubic root of 1621008249 is about 1174.7038937577.

The spelling of 1621008249 in words is "one billion, six hundred twenty-one million, eight thousand, two hundred forty-nine".