1001211990 has 32 divisors (see below), whose sum is σ = 2426707296. Its totient is φ = 264345600.

The previous prime is 1001211989. The next prime is 1001212013. The reversal of 1001211990 is 991121001.

It is a self number, because there is not a number n which added to its sum of digits gives 1001211990.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 162187 + ... + 168246.

It is an arithmetic number, because the mean of its divisors is an integer number (75834603).

Almost surely, 2^1001211990 is an apocalyptic number.

1001211990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1001211990 is an abundant number, since it is smaller than the sum of its proper divisors (1425495306).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1001211990 is a wasteful number, since it uses less digits than its factorization.

1001211990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330544.

The product of its (nonzero) digits is 162, while the sum is 24.

The square root of 1001211990 is about 31641.9340432913. The cubic root of 1001211990 is about 1000.4038335632.

Adding to 1001211990 its reverse (991121001), we get a palindrome (1992332991).

The spelling of 1001211990 in words is "one billion, one million, two hundred eleven thousand, nine hundred ninety".