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121638493 is a prime number
BaseRepresentation
bin1110100000000…
…00111001011101
322110212212122101
413100000321131
5222114412433
620023045101
73004624114
oct720007135
9273785571
10121638493
1162730889
12348a0791
131c27b952
1412224c7b
15aa2b07d
hex7400e5d

121638493 has 2 divisors, whose sum is σ = 121638494. Its totient is φ = 121638492.

The previous prime is 121638487. The next prime is 121638509. The reversal of 121638493 is 394836121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 115498009 + 6140484 = 10747^2 + 2478^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-121638493 is a prime.

It is a super-2 number, since 2×1216384932 = 29591845958622098, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121638463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60819246 + 60819247.

It is an arithmetic number, because the mean of its divisors is an integer number (60819247).

Almost surely, 2121638493 is an apocalyptic number.

It is an amenable number.

121638493 is a deficient number, since it is larger than the sum of its proper divisors (1).

121638493 is an equidigital number, since it uses as much as digits as its factorization.

121638493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 37.

The square root of 121638493 is about 11028.9842233997. The cubic root of 121638493 is about 495.4772026305.

The spelling of 121638493 in words is "one hundred twenty-one million, six hundred thirty-eight thousand, four hundred ninety-three".