161700431 has 8 divisors (see below), whose sum is σ = 170484720. Its totient is φ = 152943552.

The previous prime is 161700389. The next prime is 161700437. The reversal of 161700431 is 134007161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161700431 is a prime.

It is a super-2 number, since 2×161700431² = 52294058771171522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161700397 and 161700406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161700437) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5891 + ... + 18923.

It is an arithmetic number, because the mean of its divisors is an integer number (21310590).

Almost surely, 2^161700431 is an apocalyptic number.

161700431 is a deficient number, since it is larger than the sum of its proper divisors (8784289).

161700431 is a wasteful number, since it uses less digits than its factorization.

161700431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13705.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 161700431 is about 12716.1484341761. The cubic root of 161700431 is about 544.7999501449.

Adding to 161700431 its reverse (134007161), we get a palindrome (295707592).

The spelling of 161700431 in words is "one hundred sixty-one million, seven hundred thousand, four hundred thirty-one".