1210956985 has 32 divisors (see below), whose sum is σ = 1708169472. Its totient is φ = 806956800.

The previous prime is 1210956961. The next prime is 1210957009. The reversal of 1210956985 is 5896590121.

It is an interprime number because it is at equal distance from previous prime (1210956961) and next prime (1210957009).

It is not a de Polignac number, because 1210956985 - 2⁵ = 1210956953 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 195435 + ... + 201535.

It is an arithmetic number, because the mean of its divisors is an integer number (53380296).

Almost surely, 2^1210956985 is an apocalyptic number.

It is an amenable number.

1210956985 is a deficient number, since it is larger than the sum of its proper divisors (497212487).

1210956985 is a wasteful number, since it uses less digits than its factorization.

1210956985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6273.

The product of its (nonzero) digits is 194400, while the sum is 46.

The square root of 1210956985 is about 34798.8072353062. The cubic root of 1210956985 is about 1065.8830898332.

It can be divided in two parts, 121095698 and 5, that added together give a triangular number (121095703 = T₁₅₅₆₂).

The spelling of 1210956985 in words is "one billion, two hundred ten million, nine hundred fifty-six thousand, nine hundred eighty-five".