1620531411 has 16 divisors (see below), whose sum is σ = 2220911616. Its totient is φ = 1050479136.

The previous prime is 1620531391. The next prime is 1620531421. The reversal of 1620531411 is 1141350261.

It is a happy number.

It is not a de Polignac number, because 1620531411 - 2⁵ = 1620531379 is a prime.

It is a super-2 number, since 2×1620531411² = 5252244108075301842, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1620531421) 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, 601 + ... + 56933.

It is an arithmetic number, because the mean of its divisors is an integer number (138806976).

Almost surely, 2^1620531411 is an apocalyptic number.

1620531411 is a deficient number, since it is larger than the sum of its proper divisors (600380205).

1620531411 is a wasteful number, since it uses less digits than its factorization.

1620531411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56602.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 1620531411 is about 40255.8245599317. The cubic root of 1620531411 is about 1174.5886982945.

Adding to 1620531411 its reverse (1141350261), we get a palindrome (2761881672).

The spelling of 1620531411 in words is "one billion, six hundred twenty million, five hundred thirty-one thousand, four hundred eleven".