1621260133 has 4 divisors (see below), whose sum is σ = 1691749728. Its totient is φ = 1550770540.

The previous prime is 1621260119. The next prime is 1621260161. The reversal of 1621260133 is 3310621261.

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 1621260133 - 2¹³ = 1621251941 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1621260098 and 1621260107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621260533) 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, 35244763 + ... + 35244808.

It is an arithmetic number, because the mean of its divisors is an integer number (422937432).

Almost surely, 2^1621260133 is an apocalyptic number.

It is an amenable number.

1621260133 is a deficient number, since it is larger than the sum of its proper divisors (70489595).

1621260133 is an equidigital number, since it uses as much as digits as its factorization.

1621260133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70489594.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 1621260133 is about 40264.8746800484. The cubic root of 1621260133 is about 1174.7647352723.

Adding to 1621260133 its reverse (3310621261), we get a palindrome (4931881394).

The spelling of 1621260133 in words is "one billion, six hundred twenty-one million, two hundred sixty thousand, one hundred thirty-three".