161021967 has 16 divisors (see below), whose sum is σ = 222474240. Its totient is φ = 103485600.

The previous prime is 161021957. The next prime is 161022019. The reversal of 161021967 is 769120161.

It is not a de Polignac number, because 161021967 - 2²⁶ = 93913103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161021947) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22009 + ... + 28397.

It is an arithmetic number, because the mean of its divisors is an integer number (13904640).

Almost surely, 2^161021967 is an apocalyptic number.

161021967 is a deficient number, since it is larger than the sum of its proper divisors (61452273).

161021967 is a wasteful number, since it uses less digits than its factorization.

161021967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6694.

The product of its (nonzero) digits is 4536, while the sum is 33.

The square root of 161021967 is about 12689.4431319897. The cubic root of 161021967 is about 544.0369232706.

The spelling of 161021967 in words is "one hundred sixty-one million, twenty-one thousand, nine hundred sixty-seven".