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155000491 is a prime number
BaseRepresentation
bin10010011110100…
…01111010101011
3101210122211200221
421033101322223
5304140003431
623214110511
73561324322
oct1117217253
9353584627
10155000491
117a548188
1243aab437
132615cc89
141682b0b9
15d91b111
hex93d1eab

155000491 has 2 divisors, whose sum is σ = 155000492. Its totient is φ = 155000490.

The previous prime is 155000453. The next prime is 155000533. The reversal of 155000491 is 194000551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 155000491 - 211 = 154998443 is a prime.

It is not a weakly prime, because it can be changed into another prime (155000401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77500245 + 77500246.

It is an arithmetic number, because the mean of its divisors is an integer number (77500246).

Almost surely, 2155000491 is an apocalyptic number.

155000491 is a deficient number, since it is larger than the sum of its proper divisors (1).

155000491 is an equidigital number, since it uses as much as digits as its factorization.

155000491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 155000491 is about 12449.9193170076. The cubic root of 155000491 is about 537.1691026976.

The spelling of 155000491 in words is "one hundred fifty-five million, four hundred ninety-one", and thus it is an aban number.