1611213690 has 32 divisors (see below), whose sum is σ = 3915866880. Its totient is φ = 424217664.

The previous prime is 1611213677. The next prime is 1611213691. The reversal of 1611213690 is 963121161.

It is a super-2 number, since 2×1611213690² = 5192019109686832200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (1611213691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 337549 + ... + 342288.

It is an arithmetic number, because the mean of its divisors is an integer number (122370840).

Almost surely, 2^1611213690 is an apocalyptic number.

1611213690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1611213690 is an abundant number, since it is smaller than the sum of its proper divisors (2304653190).

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

1611213690 is a wasteful number, since it uses less digits than its factorization.

1611213690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 679926.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 1611213690 is about 40139.9263825932. The cubic root of 1611213690 is about 1172.3331556262. Note that the first 3 decimals are identical.

The spelling of 1611213690 in words is "one billion, six hundred eleven million, two hundred thirteen thousand, six hundred ninety".