1610406491 has 2 divisors, whose sum is σ = 1610406492. Its totient is φ = 1610406490.

The previous prime is 1610406437. The next prime is 1610406517. The reversal of 1610406491 is 1946040161.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1610406491 is a prime.

It is not a weakly prime, because it can be changed into another prime (1610406401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 805203245 + 805203246.

It is an arithmetic number, because the mean of its divisors is an integer number (805203246).

Almost surely, 2^1610406491 is an apocalyptic number.

1610406491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1610406491 is an equidigital number, since it uses as much as digits as its factorization.

1610406491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 1610406491 is about 40129.8703087862. The cubic root of 1610406491 is about 1172.1373479088.

The spelling of 1610406491 in words is "one billion, six hundred ten million, four hundred six thousand, four hundred ninety-one".