161625133 has 2 divisors, whose sum is σ = 161625134. Its totient is φ = 161625132.

The previous prime is 161625119. The next prime is 161625161. The reversal of 161625133 is 331526161.

It is an a-pointer prime, because the next prime (161625161) can be obtained adding 161625133 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 93760489 + 67864644 = 9683^2 + 8238^2 .

It is a cyclic number.

It is not a de Polignac number, because 161625133 - 2¹³ = 161616941 is a prime.

It is a super-2 number, since 2×161625133² = 52245367234535378, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161625193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80812566 + 80812567.

It is an arithmetic number, because the mean of its divisors is an integer number (80812567).

Almost surely, 2^161625133 is an apocalyptic number.

It is an amenable number.

161625133 is a deficient number, since it is larger than the sum of its proper divisors (1).

161625133 is an equidigital number, since it uses as much as digits as its factorization.

161625133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3240, while the sum is 28.

The square root of 161625133 is about 12713.1873658811. The cubic root of 161625133 is about 544.7153725187.

The spelling of 161625133 in words is "one hundred sixty-one million, six hundred twenty-five thousand, one hundred thirty-three".