121439851 has 6 divisors (see below), whose sum is σ = 131500140. Its totient is φ = 112098168.

The previous prime is 121439821. The next prime is 121439881. The reversal of 121439851 is 158934121.

It is an interprime number because it is at equal distance from previous prime (121439821) and next prime (121439881).

It is not a de Polignac number, because 121439851 - 2¹³ = 121431659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121439821) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 359121 + ... + 359458.

It is an arithmetic number, because the mean of its divisors is an integer number (21916690).

Almost surely, 2^121439851 is an apocalyptic number.

121439851 is a deficient number, since it is larger than the sum of its proper divisors (10060289).

121439851 is an equidigital number, since it uses as much as digits as its factorization.

121439851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 718605 (or 718592 counting only the distinct ones).

The product of its digits is 8640, while the sum is 34.

The square root of 121439851 is about 11019.9750907159. The cubic root of 121439851 is about 495.2073423116.

The spelling of 121439851 in words is "one hundred twenty-one million, four hundred thirty-nine thousand, eight hundred fifty-one".