900660121 has 3 divisors (see below), whose sum is σ = 900690133. Its totient is φ = 900630110.

The previous prime is 900660073. The next prime is 900660149. The reversal of 900660121 is 121066009.

The square root of 900660121 is 30011.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 121066009 = 11003².

It is not a de Polignac number, because 900660121 - 2⁷ = 900659993 is a prime.

It is a super-2 number, since 2×900660121² = 1622377307119469282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (900660521) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 15006 + ... + 45016.

Almost surely, 2^900660121 is an apocalyptic number.

900660121 is the 30011-st square number.

900660121 is the 15006-th centered octagonal number.

It is an amenable number.

900660121 is a deficient number, since it is larger than the sum of its proper divisors (30012).

900660121 is an frugal number, since it uses more digits than its factorization.

900660121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60022 (or 30011 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 25.

The cubic root of 900660121 is about 965.7253787015.

Multiplying 900660121 by its sum of digits (25), we get a square (22516503025 = 150055²).

The spelling of 900660121 in words is "nine hundred million, six hundred sixty thousand, one hundred twenty-one".