161349493 has 2 divisors, whose sum is σ = 161349494. Its totient is φ = 161349492.

The previous prime is 161349469. The next prime is 161349511. The reversal of 161349493 is 394943161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 95707089 + 65642404 = 9783^2 + 8102^2 .

It is a cyclic number.

It is not a de Polignac number, because 161349493 - 2²¹ = 159252341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161349893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80674746 + 80674747.

It is an arithmetic number, because the mean of its divisors is an integer number (80674747).

Almost surely, 2^161349493 is an apocalyptic number.

It is an amenable number.

161349493 is a deficient number, since it is larger than the sum of its proper divisors (1).

161349493 is an equidigital number, since it uses as much as digits as its factorization.

161349493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69984, while the sum is 40.

The square root of 161349493 is about 12702.3420281458. The cubic root of 161349493 is about 544.4055387335.

The spelling of 161349493 in words is "one hundred sixty-one million, three hundred forty-nine thousand, four hundred ninety-three".