1210099981 has 8 divisors (see below), whose sum is σ = 1229515200. Its totient is φ = 1190814240.

The previous prime is 1210099963. The next prime is 1210099991. The reversal of 1210099981 is 1899900121.

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 1210099981 - 2¹⁵ = 1210067213 is a prime.

It is a super-2 number, since 2×1210099981² = 2928683928032400722, 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 (1210099991) 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, 13441 + ... + 50998.

It is an arithmetic number, because the mean of its divisors is an integer number (153689400).

Almost surely, 2^1210099981 is an apocalyptic number.

It is an amenable number.

1210099981 is a deficient number, since it is larger than the sum of its proper divisors (19415219).

1210099981 is an equidigital number, since it uses as much as digits as its factorization.

1210099981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64739.

The product of its (nonzero) digits is 11664, while the sum is 40.

The square root of 1210099981 is about 34786.4913579970. The cubic root of 1210099981 is about 1065.6315858143.

The spelling of 1210099981 in words is "one billion, two hundred ten million, ninety-nine thousand, nine hundred eighty-one".