161433457 has 2 divisors, whose sum is σ = 161433458. Its totient is φ = 161433456.

The previous prime is 161433439. The next prime is 161433473. The reversal of 161433457 is 754334161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 139145616 + 22287841 = 11796^2 + 4721^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161433457 is a prime.

It is a super-2 number, since 2×161433457² = 52121522077941698, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161433497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80716728 + 80716729.

It is an arithmetic number, because the mean of its divisors is an integer number (80716729).

Almost surely, 2^161433457 is an apocalyptic number.

It is an amenable number.

161433457 is a deficient number, since it is larger than the sum of its proper divisors (1).

161433457 is an equidigital number, since it uses as much as digits as its factorization.

161433457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 34.

The square root of 161433457 is about 12705.6466580808. The cubic root of 161433457 is about 544.4999560117.

It can be divided in two parts, 16143 and 3457, that added together give a square (19600 = 140²).

The spelling of 161433457 in words is "one hundred sixty-one million, four hundred thirty-three thousand, four hundred fifty-seven".