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121989154 = 2731281081
BaseRepresentation
bin1110100010101…
…10100000100010
322111112200122211
413101112200202
5222212123104
620034352334
73010614340
oct721264042
9274480584
10121989154
1162950291
1234a2b6aa
131c372441
14122b6990
15aa99e04
hex7456822

121989154 has 16 divisors (see below), whose sum is σ = 215870976. Its totient is φ = 50594400.

The previous prime is 121989149. The next prime is 121989163. The reversal of 121989154 is 451989121.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140107 + ... + 140974.

It is an arithmetic number, because the mean of its divisors is an integer number (13491936).

Almost surely, 2121989154 is an apocalyptic number.

121989154 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

121989154 is a deficient number, since it is larger than the sum of its proper divisors (93881822).

121989154 is a wasteful number, since it uses less digits than its factorization.

121989154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281121.

The product of its digits is 25920, while the sum is 40.

The square root of 121989154 is about 11044.8700309239. The cubic root of 121989154 is about 495.9528685054.

The spelling of 121989154 in words is "one hundred twenty-one million, nine hundred eighty-nine thousand, one hundred fifty-four".

Divisors: 1 2 7 14 31 62 217 434 281081 562162 1967567 3935134 8713511 17427022 60994577 121989154