1621240313 has 24 divisors (see below), whose sum is σ = 2059797600. Its totient is φ = 1261821120.

The previous prime is 1621240301. The next prime is 1621240351. The reversal of 1621240313 is 3130421261.

It is not a de Polignac number, because 1621240313 - 2⁴ = 1621240297 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1621240363) 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, 771338 + ... + 773436.

It is an arithmetic number, because the mean of its divisors is an integer number (85824900).

Almost surely, 2^1621240313 is an apocalyptic number.

It is an amenable number.

1621240313 is a deficient number, since it is larger than the sum of its proper divisors (438557287).

1621240313 is a wasteful number, since it uses less digits than its factorization.

1621240313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3557 (or 3550 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 1621240313 is about 40264.6285590715. The cubic root of 1621240313 is about 1174.7599480636.

Adding to 1621240313 its reverse (3130421261), we get a palindrome (4751661574).

The spelling of 1621240313 in words is "one billion, six hundred twenty-one million, two hundred forty thousand, three hundred thirteen".