161226151 has 4 divisors (see below), whose sum is σ = 162705400. Its totient is φ = 159746904.

The previous prime is 161226137. The next prime is 161226157. The reversal of 161226151 is 151622161.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 151622161 = 109 ⋅1391029.

It is a cyclic number.

It is not a de Polignac number, because 161226151 - 2¹⁷ = 161095079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161226157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 739461 + ... + 739678.

It is an arithmetic number, because the mean of its divisors is an integer number (40676350).

Almost surely, 2^161226151 is an apocalyptic number.

161226151 is a deficient number, since it is larger than the sum of its proper divisors (1479249).

161226151 is a wasteful number, since it uses less digits than its factorization.

161226151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1479248.

The product of its digits is 720, while the sum is 25.

The square root of 161226151 is about 12697.4860110181. The cubic root of 161226151 is about 544.2667815875.

It can be divided in two parts, 161 and 226151, that multiplied together give a triangular number (36410311 = T₈₅₃₃).

The spelling of 161226151 in words is "one hundred sixty-one million, two hundred twenty-six thousand, one hundred fifty-one".