161695149 has 72 divisors (see below), whose sum is σ = 289791648. Its totient is φ = 79289280.

The previous prime is 161695147. The next prime is 161695151. The reversal of 161695149 is 941596161.

161695149 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (161695147) and next prime (161695151).

It is not a de Polignac number, because 161695149 - 2¹ = 161695147 is a prime.

It is a super-2 number, since 2×161695149² = 52290642420264402, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 161695149.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161695147) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 583599 + ... + 583875.

It is an arithmetic number, because the mean of its divisors is an integer number (4024884).

Almost surely, 2^161695149 is an apocalyptic number.

161695149 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

161695149 is a deficient number, since it is larger than the sum of its proper divisors (128096499).

161695149 is a wasteful number, since it uses less digits than its factorization.

161695149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343 (or 317 counting only the distinct ones).

The product of its digits is 58320, while the sum is 42.

The square root of 161695149 is about 12715.9407438066. The cubic root of 161695149 is about 544.7940180546.

The spelling of 161695149 in words is "one hundred sixty-one million, six hundred ninety-five thousand, one hundred forty-nine".