161950451 has 16 divisors (see below), whose sum is σ = 179419968. Its totient is φ = 145228800.

The previous prime is 161950447. The next prime is 161950493. The reversal of 161950451 is 154059161.

It is a cyclic number.

It is not a de Polignac number, because 161950451 - 2² = 161950447 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161950441) 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, 165275 + ... + 166251.

It is an arithmetic number, because the mean of its divisors is an integer number (11213748).

Almost surely, 2^161950451 is an apocalyptic number.

161950451 is a deficient number, since it is larger than the sum of its proper divisors (17469517).

161950451 is a wasteful number, since it uses less digits than its factorization.

161950451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1342.

The product of its (nonzero) digits is 5400, while the sum is 32.

The square root of 161950451 is about 12725.9754439493. The cubic root of 161950451 is about 545.0805940908.

The spelling of 161950451 in words is "one hundred sixty-one million, nine hundred fifty thousand, four hundred fifty-one".