161154972 has 72 divisors (see below), whose sum is σ = 459753840. Its totient is φ = 47147520.

The previous prime is 161154971. The next prime is 161155031. The reversal of 161154972 is 279451161.

161154972 is a `hidden beast` number, since 161 + 1 + 5 + 497 + 2 = 666.

161154972 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161154971) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4468 + ... + 18500.

It is an arithmetic number, because the mean of its divisors is an integer number (6385470).

Almost surely, 2^161154972 is an apocalyptic number.

161154972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161154972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (229876920).

161154972 is an abundant number, since it is smaller than the sum of its proper divisors (298598868).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161154972 is a wasteful number, since it uses less digits than its factorization.

161154972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14083 (or 14078 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 161154972 is about 12694.6828239228. The cubic root of 161154972 is about 544.1866745091.

The spelling of 161154972 in words is "one hundred sixty-one million, one hundred fifty-four thousand, nine hundred seventy-two".