1610981 has 2 divisors, whose sum is σ = 1610982. Its totient is φ = 1610980.

The previous prime is 1610969. The next prime is 1610993. The reversal of 1610981 is 1890161.

It is a balanced prime because it is at equal distance from previous prime (1610969) and next prime (1610993).

It can be written as a sum of positive squares in only one way, i.e., 1018081 + 592900 = 1009^2 + 770^2 .

It is a cyclic number.

It is not a de Polignac number, because 1610981 - 2¹⁴ = 1594597 is a prime.

It is a super-2 number, since 2×1610981² = 5190519564722, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 1610981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1610941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 805490 + 805491.

It is an arithmetic number, because the mean of its divisors is an integer number (805491).

2^1610981 is an apocalyptic number.

It is an amenable number.

1610981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1610981 is an equidigital number, since it uses as much as digits as its factorization.

1610981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 26.

The square root of 1610981 is about 1269.2442633315. The cubic root of 1610981 is about 117.2276717150.

The spelling of 1610981 in words is "one million, six hundred ten thousand, nine hundred eighty-one".