161625471 has 12 divisors (see below), whose sum is σ = 250684632. Its totient is φ = 92357328.

The previous prime is 161625467. The next prime is 161625473. The reversal of 161625471 is 174526161.

It is not a de Polignac number, because 161625471 - 2² = 161625467 is a prime.

It is a super-3 number, since 3×161625471³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161625473) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 549600 + ... + 549893.

It is an arithmetic number, because the mean of its divisors is an integer number (20890386).

Almost surely, 2^161625471 is an apocalyptic number.

161625471 is a deficient number, since it is larger than the sum of its proper divisors (89059161).

161625471 is a wasteful number, since it uses less digits than its factorization.

161625471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1099510 (or 1099503 counting only the distinct ones).

The product of its digits is 10080, while the sum is 33.

The square root of 161625471 is about 12713.2006591574. The cubic root of 161625471 is about 544.7157522321.

The spelling of 161625471 in words is "one hundred sixty-one million, six hundred twenty-five thousand, four hundred seventy-one".