1009620100581 has 4 divisors (see below), whose sum is σ = 1346160134112. Its totient is φ = 673080067052.

The previous prime is 1009620100499. The next prime is 1009620100637. The reversal of 1009620100581 is 1850010269001.

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 1009620100581 - 2⁷ = 1009620100453 is a prime.

It is a super-2 number, since 2×1009620100581² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1009620100081) 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, 168270016761 + ... + 168270016766.

It is an arithmetic number, because the mean of its divisors is an integer number (336540033528).

Almost surely, 2^{1009620100581} is an apocalyptic number.

It is an amenable number.

1009620100581 is a deficient number, since it is larger than the sum of its proper divisors (336540033531).

1009620100581 is an equidigital number, since it uses as much as digits as its factorization.

1009620100581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336540033530.

The product of its (nonzero) digits is 4320, while the sum is 33.

Adding to 1009620100581 its reverse (1850010269001), we get a palindrome (2859630369582).

The spelling of 1009620100581 in words is "one trillion, nine billion, six hundred twenty million, one hundred thousand, five hundred eighty-one".