1621130601 has 4 divisors (see below), whose sum is σ = 2161507472. Its totient is φ = 1080753732.

The previous prime is 1621130587. The next prime is 1621130629. The reversal of 1621130601 is 1060311261.

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 de Polignac number, because none of the positive numbers 2^k-1621130601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1621130101) 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, 270188431 + ... + 270188436.

It is an arithmetic number, because the mean of its divisors is an integer number (540376868).

Almost surely, 2^1621130601 is an apocalyptic number.

It is an amenable number.

1621130601 is a deficient number, since it is larger than the sum of its proper divisors (540376871).

1621130601 is an equidigital number, since it uses as much as digits as its factorization.

1621130601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540376870.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 1621130601 is about 40263.2661491837. The cubic root of 1621130601 is about 1174.7334481529.

Adding to 1621130601 its reverse (1060311261), we get a palindrome (2681441862).

The spelling of 1621130601 in words is "one billion, six hundred twenty-one million, one hundred thirty thousand, six hundred one".