161501151 has 16 divisors (see below), whose sum is σ = 249064704. Its totient is φ = 91173504.

The previous prime is 161501149. The next prime is 161501161. The reversal of 161501151 is 151105161.

It is a happy number.

It is not a de Polignac number, because 161501151 - 2¹ = 161501149 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161501111) 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, 44586 + ... + 48071.

It is an arithmetic number, because the mean of its divisors is an integer number (15566544).

Almost surely, 2^161501151 is an apocalyptic number.

161501151 is a deficient number, since it is larger than the sum of its proper divisors (87563553).

161501151 is an equidigital number, since it uses as much as digits as its factorization.

161501151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92750.

The product of its (nonzero) digits is 150, while the sum is 21.

The square root of 161501151 is about 12708.3103125475. The cubic root of 161501151 is about 544.5760538868.

The spelling of 161501151 in words is "one hundred sixty-one million, five hundred one thousand, one hundred fifty-one".