161026739 has 4 divisors (see below), whose sum is σ = 161749056. Its totient is φ = 160304424.

The previous prime is 161026709. The next prime is 161026757. The reversal of 161026739 is 937620161.

161026739 = 117² + 118² + ... + 785².

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 937620161 = 1097 ⋅854713.

It is a cyclic number.

It is not a de Polignac number, because 161026739 - 2¹² = 161022643 is a prime.

It is a super-2 number, since 2×161026739² = 51859221345948242, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161026699 and 161026708.

It is not an unprimeable number, because it can be changed into a prime (161026709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 360824 + ... + 361269.

It is an arithmetic number, because the mean of its divisors is an integer number (40437264).

Almost surely, 2^161026739 is an apocalyptic number.

161026739 is a deficient number, since it is larger than the sum of its proper divisors (722317).

161026739 is an equidigital number, since it uses as much as digits as its factorization.

161026739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 722316.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 161026739 is about 12689.6311609124. The cubic root of 161026739 is about 544.0422975240.

The spelling of 161026739 in words is "one hundred sixty-one million, twenty-six thousand, seven hundred thirty-nine".