121731628 has 24 divisors (see below), whose sum is σ = 231662592. Its totient is φ = 55736064.

The previous prime is 121731593. The next prime is 121731671. The reversal of 121731628 is 826137121.

It is a self number, because there is not a number n which added to its sum of digits gives 121731628.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 21676 + ... + 26707.

It is an arithmetic number, because the mean of its divisors is an integer number (9652608).

Almost surely, 2^121731628 is an apocalyptic number.

It is an amenable number.

121731628 is a deficient number, since it is larger than the sum of its proper divisors (109930964).

121731628 is a wasteful number, since it uses less digits than its factorization.

121731628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48441 (or 48439 counting only the distinct ones).

The product of its digits is 4032, while the sum is 31.

The square root of 121731628 is about 11033.2056991611. The cubic root of 121731628 is about 495.6036277874.

Adding to 121731628 its reverse (826137121), we get a palindrome (947868749).

The spelling of 121731628 in words is "one hundred twenty-one million, seven hundred thirty-one thousand, six hundred twenty-eight".