900881509 has 4 divisors (see below), whose sum is σ = 982779840. Its totient is φ = 818983180.

The previous prime is 900881473. The next prime is 900881521. The reversal of 900881509 is 905188009.

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 900881509 - 2⁷ = 900881381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (900881309) 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, 40949149 + ... + 40949170.

It is an arithmetic number, because the mean of its divisors is an integer number (245694960).

Almost surely, 2^900881509 is an apocalyptic number.

It is an amenable number.

900881509 is a deficient number, since it is larger than the sum of its proper divisors (81898331).

900881509 is a wasteful number, since it uses less digits than its factorization.

900881509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81898330.

The product of its (nonzero) digits is 25920, while the sum is 40.

The square root of 900881509 is about 30014.6882209361. The cubic root of 900881509 is about 965.8044993708.

The spelling of 900881509 in words is "nine hundred million, eight hundred eighty-one thousand, five hundred nine".