1981190101 has 8 divisors (see below), whose sum is σ = 2162560608. Its totient is φ = 1800030000.

The previous prime is 1981190083. The next prime is 1981190117. The reversal of 1981190101 is 1010911891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1981190101 - 2²¹ = 1979092949 is a prime.

It is a super-2 number, since 2×1981190101² = 7850228432600780402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1981190161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32575 + ... + 70876.

It is an arithmetic number, because the mean of its divisors is an integer number (270320076).

Almost surely, 2^1981190101 is an apocalyptic number.

1981190101 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1981190101 is a deficient number, since it is larger than the sum of its proper divisors (181370507).

1981190101 is a wasteful number, since it uses less digits than its factorization.

1981190101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105203.

The product of its (nonzero) digits is 648, while the sum is 31.

The square root of 1981190101 is about 44510.5616792240. The cubic root of 1981190101 is about 1255.9587708500.

The spelling of 1981190101 in words is "one billion, nine hundred eighty-one million, one hundred ninety thousand, one hundred one".