1621264535 has 16 divisors (see below), whose sum is σ = 2142225792. Its totient is φ = 1168077600.

The previous prime is 1621264531. The next prime is 1621264543. The reversal of 1621264535 is 5354621261.

It is not a de Polignac number, because 1621264535 - 2² = 1621264531 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1621264495 and 1621264504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621264531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 131861 + ... + 143630.

It is an arithmetic number, because the mean of its divisors is an integer number (133889112).

Almost surely, 2^1621264535 is an apocalyptic number.

1621264535 is a deficient number, since it is larger than the sum of its proper divisors (520961257).

1621264535 is a wasteful number, since it uses less digits than its factorization.

1621264535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275614.

The product of its digits is 43200, while the sum is 35.

The square root of 1621264535 is about 40264.9293430400. The cubic root of 1621264535 is about 1174.7657985008.

Adding to 1621264535 its reverse (5354621261), we get a palindrome (6975885796).

It can be divided in two parts, 162126 and 4535, that added together give a palindrome (166661).

The spelling of 1621264535 in words is "one billion, six hundred twenty-one million, two hundred sixty-four thousand, five hundred thirty-five".